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  • 351. Frasinski, L. J.
    et al.
    Zhaunerchyk, Vitali
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Molekyl- och kondenserade materiens fysik.
    Mucke, Melanie
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Molekyl- och kondenserade materiens fysik.
    Squibb, Richard J.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Molekyl- och kondenserade materiens fysik.
    Siano, M.
    Eland, John H. D.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Molekyl- och kondenserade materiens fysik.
    Linusson, P.
    v. d. Meulen, P.
    Salen, P.
    Thomas, R. D.
    Larsson, M.
    Foucar, L.
    Ullrich, J.
    Motomura, K.
    Mondal, S.
    Ueda, K.
    Osipov, T.
    Fang, L.
    Murphy, B. F.
    Berrah, N.
    Bostedt, C.
    Bozek, J. D.
    Schorb, S.
    Messerschmidt, M.
    Glownia, J. M.
    Cryan, J. P.
    Coffee, R. N.
    Takahashi, O.
    Wada, S.
    Piancastelli, Maria Novella
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Molekyl- och kondenserade materiens fysik.
    Richter, R.
    Prince, K. C.
    Feifel, Raimund
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Molekyl- och kondenserade materiens fysik.
    Dynamics of Hollow Atom Formation in Intense X-Ray Pulses Probed by Partial Covariance Mapping2013Inngår i: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 111, nr 7, artikkel-id 073002Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    When exposed to ultraintense x-radiation sources such as free electron lasers (FELs) the innermost electronic shell can efficiently be emptied, creating a transient hollow atom or molecule. Understanding the femtosecond dynamics of such systems is fundamental to achieving atomic resolution in flash diffraction imaging of noncrystallized complex biological samples. We demonstrate the capacity of a correlation method called "partial covariance mapping'' to probe the electron dynamics of neon atoms exposed to intense 8 fs pulses of 1062 eV photons. A complete picture of ionization processes competing in hollow atom formation and decay is visualized with unprecedented ease and the map reveals hitherto unobserved nonlinear sequences of photoionization and Auger events. The technique is particularly well suited to the high counting rate inherent in FEL experiments.

  • 352.
    Froelich, Piotr
    et al.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Kemiska sektionen, Institutionen för fysikalisk och analytisk kemi, Kvantkemi.
    Jonsell, Svante
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Kemiska sektionen, Institutionen för fysikalisk och analytisk kemi, Kvantkemi.
    Saenz, Alejandro
    Zygelman, Bernard
    Dalgarno, Alex
    Hydrogen-antihydrogen collisions2000Inngår i: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 84, nr 20, s. 4577-4580Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Matter-antimatter interactions are investigated using hydrogen-antihydrogen collisions as an example. Cross sections for elastic scattering and for the antihydrogen loss (either through the rearrangement reaction, resulting in formation of protonium and positronium according to H+H →pp+1 e+e-, or via annihilation in flight) are calculated for the first time in a fully quantum mechanical approach. Implications for experiments intending to trap and cool antihydrogen are discussed.

  • 353.
    Froelich, Piotr
    et al.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Kemiska sektionen, Institutionen för kvantkemi. Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Kemiska sektionen, Institutionen för fysikalisk och analytisk kemi, Kvantkemi.
    Saenz, Alejandro
    Calculation of the beta-decay spectrum of the T-2 molecule beyond the sudden impulse approximation1996Inngår i: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 77, nr 23, s. 4724-4727Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The probability distribution of electronic excitations of HeT+ following the beta decay of the T-2 molecule has been calculated for the first time in the beyond sudden impulse approximation, removing the uncertainty related to the reliability of this appr

  • 354.
    Froelich, Piotr
    et al.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Kemiska sektionen, Institutionen för fysikalisk och analytisk kemi, Kvantkemi.
    Wallenius, Jan
    Resonance Sidepath in Muon Catalyzed Fusion1995Inngår i: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 75, nr 11, s. 2108-2111Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    We have investigated a previously unconsidered sidepath in muon catalyzed fusion. We have found that high formation rates of metastable dt mu* molecules in t mu(2s)-D-2 collisions and their subsequent decay into t mu(1s) or d mu(1s) atoms open a return path for the muon from tritium to deuterium. This process can be considered as muon transfer from tμ(2s) to dμ(1s) via three-body resonances of dtμ*. This enlarges the dμ(1s) population and quenches the muon cycling rate, in agreement with experimental findings.

  • 355. Fujii, J.
    et al.
    Salles, B. R.
    Sperl, M.
    Ueda, S.
    Kobata, M.
    Kobayashi, K.
    Yamashita, Y.
    Torelli, P.
    Utz, M.
    Fadley, C. S.
    Gray, A. X.
    Braun, J.
    Ebert, H.
    Di Marco, Igor
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Materialteori.
    Eriksson, Olle
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Materialteori.
    Thunstroem, P.
    Fecher, G. H.
    Stryhanyuk, H.
    Ikenaga, E.
    Minar, J.
    Back, C. H.
    van der Laan, G.
    Panaccione, G.
    Identifying the Electronic Character and Role of the Mn States in the Valence Band of (Ga,Mn)As2013Inngår i: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 111, nr 9, s. 097201-Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    We report high-resolution hard x-ray photoemission spectroscopy results on (Ga,Mn)As films as a function of Mn doping. Supported by theoretical calculations we identify, for both low (1%) and high (13%) Mn doping values, the electronic character of the states near the top of the valence band. Magnetization and temperature-dependent core-level photoemission spectra reveal how the delocalized character of the Mn states enables the bulk ferromagnetic properties of (Ga,Mn)As.

  • 356. Fukuzawa, H.
    et al.
    Son, S. -K
    Motomura, K.
    Mondal, S.
    Nagaya, K.
    Wada, S.
    Liu, X. -J
    Feifel, Raimund
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Molekyl- och kondenserade materiens fysik.
    Tachibana, T.
    Ito, Y.
    Kimura, M.
    Sakai, T.
    Matsunami, K.
    Hayashita, H.
    Kajikawa, J.
    Johnsson, P.
    Siano, M.
    Kukk, E.
    Rudek, B.
    Erk, B.
    Foucar, L.
    Robert, E.
    Miron, C.
    Tono, K.
    Inubushi, Y.
    Hatsui, T.
    Yabashi, M.
    Yao, M.
    Santra, R.
    Ueda, K.
    Deep Inner-Shell Multiphoton Ionization by Intense X-Ray Free-Electron Laser Pulses2013Inngår i: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 110, nr 17, artikkel-id 173005Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    We have investigated multiphoton multiple ionization dynamics of xenon atoms using a new x-ray free-electron laser facility, SPring-8 Angstrom Compact free electron LAser (SACLA) in Japan, and identified that Xen+ with n up to 26 is produced at a photon energy of 5.5 keV. The observed high charge states (n >= 24) are produced via five-photon absorption, evidencing the occurrence of multiphoton absorption involving deep inner shells. A newly developed theoretical model, which shows good agreement with the experiment, elucidates the complex pathways of sequential electronic decay cascades accessible in heavy atoms. The present study of heavy-atom ionization dynamics in high-intensity hard-x-ray pulses makes a step forward towards molecular structure determination with x-ray free-electron lasers.

  • 357. Gadea, A.
    et al.
    Lenzi, S. M.
    Lunardi, S.
    Marginean, N.
    Zuker, A. P.
    de Angelis, G.
    Axiotis, M.
    Martinez, T.
    Napoli, D. R.
    Farnea, E.
    Menegazzo, R.
    Pavan, P.
    Ur, C. A.
    Bazzacco, D.
    Venturelli, R.
    Kleinheinz, P.
    Bednarczyk, P.
    Curien, D.
    Dorvaux, O.
    Nyberg, Johan
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för kärn- och partikelfysik.
    Grawe, H.
    Gorska, M.
    Palacz, M.
    Lagergren, K.
    Milechina, L.
    Ekman, J.
    Rudolph, D.
    Andreoiu, C.
    Bentley, M. A.
    Gelletly, W.
    Rubio, B.
    Algora, A.
    Nacher, E.
    Caballero, L.
    Trotta, M.
    Moszynski, M.
    Observation of Ni-54: Cross-conjugate symmetry in f(7/2) mirror energy differences2006Inngår i: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 97, nr 15, s. 152501-Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Gamma decays from excited states up to J(pi)=6(+) in the N=Z-2 nucleus Ni-54 have been identified for the first time. Level energies are compared with those of the isobars Co-54 and Fe-54 and of the cross-conjugate nuclei of mass A=42. The good but puzzling f(7/2) cross-conjugate symmetry in mirror and triplet energy differences is analyzed. Shell model calculations reproduce the new data but the necessary nuclear charge-dependent phenomenology is not fully explained by modern nucleon-nucleon potentials.

  • 358. Gerritsen, Margot
    et al.
    Kreiss, Gunilla
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Matematisk-datavetenskapliga sektionen, Institutionen för informationsteknologi, Avdelningen för teknisk databehandling. Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Matematisk-datavetenskapliga sektionen, Institutionen för informationsteknologi, Numerisk analys.
    Blumenfeld, Raphael
    Stress chain solutions in two-dimensional isostatic granular systems: Fabric-dependent paths, leakage, and branching2008Inngår i: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 101, s. 098001:1-4Artikkel i tidsskrift (Fagfellevurdert)
  • 359. Glawion, S.
    et al.
    Heidler, J.
    Haverkort, M. W.
    Duda, Laurent C.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Mjukröntgenfysik.
    Schmitt, T.
    Strocov, V. N.
    Monney, C.
    Zhou, K.
    Ruff, A.
    Sing, M.
    Claessen, R.
    Two-Spinon and Orbital Excitations of the Spin-Peierls System TiOCl2011Inngår i: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 107, nr 10, s. 107402-Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    We combine high-resolution resonant inelastic x-ray scattering with cluster calculations utilizing a recently derived effective magnetic scattering operator to analyze the polarization, excitation energy, and momentum-dependent excitation spectrum of the low-dimensional quantum magnet TiOCl in the range expected for orbital and magnetic excitations (0-2.5 eV). Ti 3d orbital excitations yield complete information on the temperature-dependent crystal-field splitting. In the spin-Peierls phase we observe a dispersive two-spinon excitation and estimate the inter- and intradimer magnetic exchange coupling from a comparison to cluster calculations.

  • 360. Glawion, S.
    et al.
    Heidler, J.
    Haverkort, M.W.
    Duda, Laurent-Claudius
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Molekyl- och kondenserade materiens fysik.
    Schmitt, T.
    Swiss Light Source.
    Strocov, V.N.
    Swiss Light Source.
    Monney, C.
    Zhou, K.
    Ruff, A
    Sing, M.
    Claessen, R.
    Two-Spinon and Orbital Excitations of the Spin-Peierls System TiOCl2011Inngår i: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 107, nr 10, artikkel-id 107402Artikkel i tidsskrift (Fagfellevurdert)
  • 361.
    Goldsztejn, G.
    et al.
    Univ Paris 06, Sorbonne Univ, Lab Chim Phys Mat & Rayonnement, CNRS,UMR 7614, F-75005 Paris, France..
    Marchenko, T.
    Univ Paris 06, Sorbonne Univ, Lab Chim Phys Mat & Rayonnement, CNRS,UMR 7614, F-75005 Paris, France.;Synchrotron SOLEIL, Orme Merisiers, BP 48, F-91192 Gif Sur Yvette, France..
    Puettner, R.
    Free Univ Berlin, Inst Expt Phys, Arnimallee 14, D-14195 Berlin, Germany..
    Journel, L.
    Univ Paris 06, Sorbonne Univ, Lab Chim Phys Mat & Rayonnement, CNRS,UMR 7614, F-75005 Paris, France.;Synchrotron SOLEIL, Orme Merisiers, BP 48, F-91192 Gif Sur Yvette, France..
    Guillemin, R.
    Univ Paris 06, Sorbonne Univ, Lab Chim Phys Mat & Rayonnement, CNRS,UMR 7614, F-75005 Paris, France.;Synchrotron SOLEIL, Orme Merisiers, BP 48, F-91192 Gif Sur Yvette, France..
    Carniato, S.
    Univ Paris 06, Sorbonne Univ, Lab Chim Phys Mat & Rayonnement, CNRS,UMR 7614, F-75005 Paris, France..
    Selles, P.
    Univ Paris 06, Sorbonne Univ, Lab Chim Phys Mat & Rayonnement, CNRS,UMR 7614, F-75005 Paris, France..
    Travnikova, O.
    Univ Paris 06, Sorbonne Univ, Lab Chim Phys Mat & Rayonnement, CNRS,UMR 7614, F-75005 Paris, France.;Synchrotron SOLEIL, Orme Merisiers, BP 48, F-91192 Gif Sur Yvette, France..
    Ceolin, D.
    Synchrotron SOLEIL, Orme Merisiers, BP 48, F-91192 Gif Sur Yvette, France..
    Lago, A. F.
    Univ Fed ABC UFABC, Ctr Ciencias Nat & Humanas, Rua Santa Adelia 166, BR-09210170 Santo Andre, SP, Brazil..
    Feifel, R.
    Univ Gothenburg, Dept Phys, SE-41296 Gothenburg, Sweden..
    Lablanquie, P.
    Univ Paris 06, Sorbonne Univ, Lab Chim Phys Mat & Rayonnement, CNRS,UMR 7614, F-75005 Paris, France..
    Piancastelli, Maria N.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Molekyl- och kondenserade materiens fysik. Univ Paris 06, Sorbonne Univ, Lab Chim Phys Mat & Rayonnement, CNRS,UMR 7614, F-75005 Paris, France..
    Penent, F.
    Univ Paris 06, Sorbonne Univ, Lab Chim Phys Mat & Rayonnement, CNRS,UMR 7614, F-75005 Paris, France..
    Simon, M.
    Univ Paris 06, Sorbonne Univ, Lab Chim Phys Mat & Rayonnement, CNRS,UMR 7614, F-75005 Paris, France.;Synchrotron SOLEIL, Orme Merisiers, BP 48, F-91192 Gif Sur Yvette, France..
    Double-Core-Hole States in Neon: Lifetime, Post-Collision Interaction, and Spectral Assignment2016Inngår i: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 117, nr 13, artikkel-id 133001Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Using synchrotron radiation and high-resolution electron spectroscopy, we have directly observed and identified specific photoelectrons from K-2V states in neon corresponding to simultaneous 1s ionization and 1s -> valence excitation. The natural lifetime broadening of the K-2V states and the relative intensities of different types of shakeup channels have been determined experimentally and compared to ab initio calculations. Moreover, the high-energy Auger spectrum resulting from the decay of Ne2+K-2 and Ne+K-2V states as well as from participator Auger decay from Ne+K-1L-1V states, has been measured and assigned in detail utilizing the characteristic differences in lifetime broadenings of these core hole states. Furthermore, post collision interaction broadening of Auger peaks is clearly observed only in the hypersatellite spectrum from K-2 states, due to the energy sharing between the two 1s photoelectrons which favors the emission of one slow and one fast electron.

  • 362. Gorczyca, Thomas
    et al.
    Rubensson, Jan-Erik
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Fysiska institutionen.
    Såthe, Conny
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Fysiska institutionen.
    Ström, Magnus
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Fysiska institutionen.
    Agåker, Marcus
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Fysiska institutionen, Fysik II.
    Ding, Dajun
    Stranges, Stefano
    Richter, Robert
    Alagia, Michele
    Radiative and Relativistic Effects in the Decay of Highly Excited States in Helium2000Inngår i: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 85, nr 6, s. 1202-1205Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    A recent experimental study [J.-E. Rubensson et al., Phys. Rev. Lett. 83, 947 (1999)] measured a significant fluorescence yield of the He( 2lnl) photoexcited resonances, showing major qualitative differences from nonrelativistic predictions. We present a further theoretical study of these states, and perform R-matrix multichannel quantum defect theory calculations to extract fluorescence and ionization cross sections. These theoretical results are in excellent agreement with newer, higher-resolution measurements. Radiative and spin-orbit effects are quantified and shown to play an important role in the overall characterization of highly excited states.

  • 363.
    Graham, Daniel B.
    et al.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutet för rymdfysik, Uppsalaavdelningen.
    Cairns, Iver H.
    Constraints on the Formation and Structure of Langmuir Eigenmodes in the Solar Wind2013Inngår i: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 111, nr 12, s. 121101-Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Localized Langmuir waves are commonly observed in space plasmas and are a potential source of radio waves. Using electric field data from STEREO, it is shown that these localized Langmuir waves are eigenmodes of density wells estimated independently. An analytic model is developed for the eigenmode frequencies. The inferred depths and widths of the density wells typically only allow the zeroth-order Langmuir eigenmode to form, explaining the preponderance of single-peaked waveforms. More complicated waveforms are shown to be consistent with single eigenmode solutions of more complicated density profiles. The inferred depth of the density well increases with Langmuir wave intensity, consistent with the ponderomotive force but not wave packet collapse.

  • 364.
    Graham, Daniel B.
    et al.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutet för rymdfysik, Uppsalaavdelningen.
    Khotyaintsev, Yuri V.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutet för rymdfysik, Uppsalaavdelningen.
    Vaivads, Andris
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutet för rymdfysik, Uppsalaavdelningen.
    André, Mats
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutet för rymdfysik, Uppsalaavdelningen.
    Fazakerley, A. N.
    Electron Dynamics in the Diffusion Region of an Asymmetric Magnetic Reconnection2014Inngår i: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 112, nr 21, s. 215004-Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    During a magnetopause crossing near the subsolar point Cluster observes the ion diffusion region of antiparallel magnetic reconnection. The reconnecting plasmas are asymmetric, differing in magnetic field strength, density, and temperature. Spatial changes in the electron distributions in the diffusion region are resolved and investigated in detail. Heating of magnetosheath electrons parallel to the magnetic field is observed. This heating is shown to be consistent with trapping of magnetosheath electrons by parallel electric fields.

  • 365.
    Graham, Daniel B.
    et al.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutet för rymdfysik, Uppsalaavdelningen.
    Khotyaintsev, Yuri V.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutet för rymdfysik, Uppsalaavdelningen.
    Vaivads, Andris
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutet för rymdfysik, Uppsalaavdelningen.
    Norgren, Cecilia
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutet för rymdfysik, Uppsalaavdelningen. Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Rymd- och plasmafysik.
    André, Mats
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutet för rymdfysik, Uppsalaavdelningen.
    Webster, J. M.
    Rice Univ, Dept Phys & Astron, Houston, TX 77005 USA.
    Burch, J. L.
    Southwest Res Inst, San Antonio, TX 78238 USA.
    Lindqvist, P. -A
    Space and Plasma Physics, School of Electrical Engineering, KTH Royal Institute of Technology, Stockholm SE-11428, Sweden.
    Ergun, R. E.
    Univ Colorado, Lab Atmospher & Space Phys, Boulder, CO 80303 USA.
    Torbert, R. B.
    Univ New Hampshire, Space Sci Ctr, Durham, NH 03824 USA.
    Paterson, W. R.
    NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA.
    Gershman, D. J.
    Univ Maryland, Dept Astron, College Pk, MD 20742 USA;NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA.
    Giles, B. L.
    NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA.
    Magnes, W.
    Austrian Acad Sci, Space Res Inst, A-8042 Graz, Austria.
    Russell, C. T.
    Univ Calif Los Angeles, Dept Earth & Space Sci, Los Angeles, CA 90095 USA.
    Instability of Agyrotropic Electron Beams near the Electron Diffusion Region2017Inngår i: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 119, nr 2, artikkel-id 025101Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    During a magnetopause crossing the Magnetospheric Multiscale spacecraft encountered an electron diffusion region (EDR) of asymmetric reconnection. The EDR is characterized by agyrotropic beam and crescent electron distributions perpendicular to the magnetic field. Intense upper-hybrid (UH) waves are found at the boundary between the EDR and magnetosheath inflow region. The UH waves are generated by the agyrotropic electron beams. The UH waves are sufficiently large to contribute to electron diffusion and scattering, and are a potential source of radio emission near the EDR. These results provide observational evidence of wave-particle interactions at an EDR, and suggest that waves play an important role in determining the electron dynamics.

  • 366.
    Grigoriev, Anton
    et al.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Fysiska institutionen.
    Skorodumova, Natalia V.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Fysiska institutionen.
    Simak, S. I.
    Wendin, G.
    Johansson, Börje
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Fysiska institutionen.
    Ahuja, Rajeev
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Fysiska institutionen.
    Electron transport in stretched monoatomic gold wires2006Inngår i: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 97, nr 23, s. 236807-Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The conductance of monoatomic gold wires containing 3-7 gold atoms has been obtained from ab initio calculations. The transmission is found to vary significantly depending on the wire stretching and the number of incorporated atoms. Such oscillations are determined by the electronic structure of the one-dimensional (1D) part of the wire between the contacts. Our results indicate that the conductivity of 1D wires can be suppressed without breaking the contact.

  • 367. Grueneis, A.
    et al.
    Attaccalite, C.
    Pichler, T.
    Zabolotnyy, V.
    Shiozawa, H.
    Molodtsov, S. L.
    Inosov, D.
    Koitzsch, A.
    Knupfer, M.
    Schiessling, J.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Fysiska institutionen.
    Follath, R.
    Weber, R.
    Rudolf, P.
    Wirtz, L.
    Rubio, A.
    Electron-electron correlation in graphite: A combined angle-resolved photoemission and first-principles study2008Inngår i: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 100, nr 3, s. 037601-Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The full three-dimensional dispersion of the pi bands, Fermi velocities, and effective masses are measured with angle-resolved photoemission spectroscopy and compared to first-principles calculations. The band structure by density-functional theory underestimates the slope of the bands and the trigonal warping effect. Including electron-electron correlation on the level of the GW approximation, however, yields remarkable improvement in the vicinity of the Fermi level. This demonstrates the breakdown of the independent electron picture in semimetallic graphite and points toward a pronounced role of electron correlation for the interpretation of transport experiments and double-resonant Raman scattering for a wide range of carbon based materials.

  • 368. Guastalla, G.
    et al.
    DiJulio, D. D.
    Gorska, M.
    Cederkall, J.
    Boutachkov, P.
    Golubev, P.
    Pietri, S.
    Grawe, H.
    Nowacki, F.
    Sieja, K.
    Algora, A.
    Ameil, F.
    Arici, T.
    Atac, A.
    Bentley, M. A.
    Blazhev, A.
    Bloor, D.
    Brambilla, S.
    Braun, N.
    Camera, F.
    Dombradi, Zs.
    Domingo Pardo, C.
    Estrade, A.
    Farinon, F.
    Gerl, J.
    Goel, N.
    Grebosz, J.
    Habermann, T.
    Hoischen, R.
    Jansson, K.
    Jolie, J.
    Jungclaus, A.
    Kojouharov, I.
    Knoebel, R.
    Kumar, R.
    Kurcewicz, J.
    Kurz, N.
    Lalovic, N.
    Merchan, E.
    Moschner, K.
    Naqvi, F.
    Singh, B. S. Nara
    Nyberg, Johan
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Kärnfysik.
    Nociforo, C.
    Obertelli, A.
    Pfuetzner, M.
    Pietralla, N.
    Podolyak, Z.
    Prochazka, A.
    Ralet, D.
    Reiter, P.
    Rudolph, D.
    Schaffner, H.
    Schirru, F.
    Scruton, L.
    Sohler, D.
    Swaleh, T.
    Taprogge, J.
    Vajta, Zs.
    Wadsworth, R.
    Warr, N.
    Weick, H.
    Wendt, A.
    Wieland, O.
    Winfield, J. S.
    Wollersheim, H. J.
    Coulomb Excitation of Sn-104 and the Strength of the Sn-100 Shell Closure2013Inngår i: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 110, nr 17, s. 172501-Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    A measurement of the reduced transition probability for the excitation of the ground state to the first 2(+) state in Sn-104 has been performed using relativistic Coulomb excitation at GSI. Sn-104 is the lightest isotope in the Sn chain for which this quantity has been measured. The result is a key point in the discussion of the evolution of nuclear structure in the proximity of the doubly magic nucleus Sn-100. The value B(E2; 0(+) -> 2(+)) = 0.10(4) e(2)b(2) is significantly lower than earlier results for Sn-106 and heavier isotopes. The result is well reproduced by shell model predictions and therefore indicates a robust N = Z = 50 shell closure.

  • 369. Guillemin, R.
    et al.
    Sheinerman, S.
    Bomme, C.
    Journel, L.
    Marin, T.
    Marchenko, T.
    Kushawaha, R. K.
    Trcera, N.
    Piancastelli, M. N.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Yt- och gränsskiktsvetenskap.
    Simon, M.
    Ultrafast Dynamics in Postcollision Interaction after Multiple Auger Decays in Argon 1s Photoionization2012Inngår i: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 109, nr 1, s. 013001-Artikkel i tidsskrift (Fagfellevurdert)
  • 370.
    GUNNARSSON, K
    et al.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Tekniska sektionen, Institutionen för teknikvetenskaper, Fasta tillståndets fysik.
    SVEDLINDH, P
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Tekniska sektionen, Institutionen för teknikvetenskaper, Fasta tillståndets fysik.
    NORDBLAD, P
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Tekniska sektionen, Institutionen för teknikvetenskaper, Fasta tillståndets fysik.
    LUNDGREN, L
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Tekniska sektionen, Institutionen för teknikvetenskaper, Fasta tillståndets fysik.
    ARUGA, H
    ITO, A
    DYNAMICS OF AN ISING SPIN-GLASS IN THE VICINITY OF THE SPIN-GLASS TEMPERATURE1988Inngår i: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 61, s. 754-757Artikkel i tidsskrift (Fagfellevurdert)
  • 371. Gustavsson, B.
    et al.
    Leyser, Thomas
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutet för rymdfysik, Uppsalaavdelningen.
    Kosch, M.
    Rietveld, M. T.
    Steen, Å.
    Brandström, B. U. E.
    Aso, T.
    Electron gyroharmonic effects in ionization and electron acceleration during high-frequency pumping in the ionosphere2006Inngår i: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 97, nr 19, s. 195002-Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Optical emissions and incoherent scatter radar data obtained during high-frequency electromagnetic pumping of the ionospheric plasma from the ground give data on electron energization in an energy range from 2 to 100 eV. Optical emissions at 4278 angstrom from N-2(+) that require electrons with energies above the 18 eV ionization energy give the first images ever of pump-induced ionization of the thermosphere. The intensity at 4278 angstrom is asymmetric around the ionospheric electron gyroharmonic, being stronger above the gyroresonance. This contrasts with emissions at 6300 angstrom from O(D-1) and of electron temperature enhancements, which have minima at the gyroharmonic but have no apparent asymmetry. This direct evidence of pump-induced ionization contradicts previous indirect evidence, which indicated that ionization is most efficiently produced when the pump frequency was below the gyroharmonic.

  • 372.
    Hadid, Lina Z
    et al.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutet för rymdfysik, Uppsalaavdelningen. Univ Paris Saclay, Univ Paris Sud, PSL Res Univ, LPP,CNRS,Ecole Polytech,Observ Paris,Sorbonne Uni, F-91128 Palaiseau, France..
    Sahraoui, F.
    Univ Paris Saclay, Univ Paris Sud, PSL Res Univ, LPP,CNRS,Ecole Polytech,Observ Paris,Sorbonne Uni, F-91128 Palaiseau, France..
    Galtier, S.
    Univ Paris Saclay, Univ Paris Sud, PSL Res Univ, LPP,CNRS,Ecole Polytech,Observ Paris,Sorbonne Uni, F-91128 Palaiseau, France..
    Huang, S. Y.
    Wuhan Univ, Sch Elect Informat, Wuhan 430072, Hubei, Peoples R China..
    Compressible Magnetohydrodynamic Turbulence in the Earth's Magnetosheath: Estimation of the Energy Cascade Rate Using in situ Spacecraft Data2018Inngår i: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 120, nr 5, artikkel-id 055102Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The first estimation of the energy cascade rate vertical bar epsilon(C)vertical bar of magnetosheath turbulence is obtained using the Cluster and THEMIS spacecraft data and an exact law of compressible isothermal magnetohydrodynamics turbulence. The mean value of vertical bar epsilon(C)vertical bar is found to be close to 10(-13) Jm(-3) s(-1), at least 2 orders of magnitude larger than its value in the solar wind (similar to 10(-16) Jm(-3) s(-)1 in the fast wind). Two types of turbulence are evidenced and shown to be dominated either by incompressible Alfvenic or compressible magnetosoniclike fluctuations. Density fluctuations are shown to amplify the cascade rate and its spatial anisotropy in comparison with incompressible Alfvenic turbulence. Furthermore, for compressible magnetosonic fluctuations, large cascade rates are found to lie mostly near the linear kinetic instability of the mirror mode. New empirical power-laws relating vertical bar epsilon(C)vertical bar to the turbulent Mach number and to the internal energy are evidenced. These new findings have potential applications in distant astrophysical plasmas that are not accessible to in situ measurements.

  • 373.
    Hadynska-Klek, K.
    et al.
    Univ Warsaw, Heavy Ion Lab, Pasteura 5A, PL-02093 Warsaw, Poland.;Univ Warsaw, Fac Phys, PL-00681 Warsaw, Poland.;Univ Oslo, Dept Phys, N-0316 Oslo, Norway.;Ist Nazl Fis Nucl, Lab Nazl Legnaro, Viale Univ 2, I-35020 Legnaro, Italy..
    Napiorkowski, P. J.
    Univ Warsaw, Heavy Ion Lab, Pasteura 5A, PL-02093 Warsaw, Poland..
    Zielinska, M.
    Univ Warsaw, Heavy Ion Lab, Pasteura 5A, PL-02093 Warsaw, Poland.;CEA Saclay, IRFU SPhN, F-91191 Gif Sur Yvette, France..
    Srebrny, J.
    Univ Warsaw, Heavy Ion Lab, Pasteura 5A, PL-02093 Warsaw, Poland..
    Maj, A.
    Polish Acad Sci, Inst Nucl Phys, PL-31342 Krakow, Poland..
    Azaiez, F.
    Inst Phys Nucl, F-91400 Orsay, France..
    Dobon, J. J. Valiente
    Ist Nazl Fis Nucl, Lab Nazl Legnaro, Viale Univ 2, I-35020 Legnaro, Italy..
    Kicinska-Habior, M.
    Univ Warsaw, Fac Phys, PL-00681 Warsaw, Poland..
    Nowacki, F.
    Univ Strasbourg, IPHC CNRS, UMR7178, 23 Rue Loess, F-67037 Strasbourg, France..
    Naidja, H.
    Univ Strasbourg, IPHC CNRS, UMR7178, 23 Rue Loess, F-67037 Strasbourg, France.;GSI Helmholtzzentrum Schwerionenforsch GmbH, D-64291 Darmstadt, Germany.;Univ Constantine 1, LPMS, Route Ain El Bey, Constantine 25000, Algeria..
    Bounthong, B.
    Univ Strasbourg, IPHC CNRS, UMR7178, 23 Rue Loess, F-67037 Strasbourg, France..
    Rodriguez, T. R.
    Univ Autonoma Madrid, Dept Fis Teor, E-28049 Madrid, Spain..
    de Angelis, G.
    Ist Nazl Fis Nucl, Lab Nazl Legnaro, Viale Univ 2, I-35020 Legnaro, Italy..
    Abraham, T.
    Univ Warsaw, Heavy Ion Lab, Pasteura 5A, PL-02093 Warsaw, Poland..
    Kumar, G. Anil
    Polish Acad Sci, Inst Nucl Phys, PL-31342 Krakow, Poland..
    Bazzacco, D.
    Ist Nazl Fis Nucl, Sez Padova, I-35131 Padua, Italy.;Univ Padua, Dipartimento Fis & Astron, I-35131 Padua, Italy..
    Bellato, M.
    Ist Nazl Fis Nucl, Sez Padova, I-35131 Padua, Italy..
    Bortolato, D.
    Ist Nazl Fis Nucl, Sez Padova, I-35131 Padua, Italy..
    Bednarczyk, P.
    Polish Acad Sci, Inst Nucl Phys, PL-31342 Krakow, Poland..
    Benzoni, G.
    Univ Milan, Dipartimento Fis & Astron, I-20133 Milan, Italy..
    Berti, L.
    Ist Nazl Fis Nucl, Lab Nazl Legnaro, Viale Univ 2, I-35020 Legnaro, Italy..
    Birkenbach, B.
    Univ Cologne, Inst Kernphys, Zulpicher Str 77, D-50937 Cologne, Germany..
    Bruyneel, B.
    Univ Cologne, Inst Kernphys, Zulpicher Str 77, D-50937 Cologne, Germany..
    Brambilla, S.
    Univ Milan, Dipartimento Fis & Astron, I-20133 Milan, Italy..
    Camera, F.
    Univ Milan, Dipartimento Fis & Astron, I-20133 Milan, Italy.;Ist Nazl Fis Nucl, Sez Milano, I-20133 Milan, Italy..
    Chavas, J.
    CEA Saclay, IRFU SPhN, F-91191 Gif Sur Yvette, France..
    Cederwall, B.
    Royal Inst Technol, Dept Phys, SE-10691 Stockholm, Sweden..
    Charles, L.
    Univ Strasbourg, IPHC CNRS, UMR7178, 23 Rue Loess, F-67037 Strasbourg, France..
    Ciemala, M.
    Polish Acad Sci, Inst Nucl Phys, PL-31342 Krakow, Poland..
    Cocconi, P.
    Ist Nazl Fis Nucl, Lab Nazl Legnaro, Viale Univ 2, I-35020 Legnaro, Italy..
    Coleman-Smith, P.
    Daresbury Lab, Warrington WA4 4AD, Cheshire, England..
    Colombo, A.
    Ist Nazl Fis Nucl, Sez Padova, I-35131 Padua, Italy..
    Corsi, A.
    Univ Milan, Dipartimento Fis & Astron, I-20133 Milan, Italy.;Ist Nazl Fis Nucl, Sez Milano, I-20133 Milan, Italy..
    Crespi, F. C. L.
    Univ Milan, Dipartimento Fis & Astron, I-20133 Milan, Italy.;Ist Nazl Fis Nucl, Sez Milano, I-20133 Milan, Italy..
    Cullen, D. M.
    Univ Manchester, Sch Phys & Astron, Schuster Lab, Manchester M13 9PL, Lancs, England..
    Czermak, A.
    Polish Acad Sci, Inst Nucl Phys, PL-31342 Krakow, Poland..
    Desesquelles, P.
    Univ Paris 11, F-91400 Orsay, France.;CSNSM IN2P3 CNRS, F-91405 Orsay, France..
    Doherty, D. T.
    CEA Saclay, IRFU SPhN, F-91191 Gif Sur Yvette, France.;Univ York, Dept Phys, York YO10 5DD, N Yorkshire, England..
    Dulny, B.
    Polish Acad Sci, Inst Nucl Phys, PL-31342 Krakow, Poland..
    Eberth, J.
    Univ Cologne, Inst Kernphys, Zulpicher Str 77, D-50937 Cologne, Germany..
    Farnea, E.
    Ist Nazl Fis Nucl, Sez Padova, I-35131 Padua, Italy.;Univ Padua, Dipartimento Fis & Astron, I-35131 Padua, Italy..
    Fornal, B.
    Polish Acad Sci, Inst Nucl Phys, PL-31342 Krakow, Poland..
    Franchoo, S.
    Inst Phys Nucl, F-91400 Orsay, France..
    Gadea, A.
    Univ Valencia, CSIC, Inst Fis Corpuscular, IFIC, S-46980 Valencia, Spain..
    Giaz, A.
    Univ Milan, Dipartimento Fis & Astron, I-20133 Milan, Italy.;Ist Nazl Fis Nucl, Sez Milano, I-20133 Milan, Italy..
    Gottardo, A.
    Ist Nazl Fis Nucl, Lab Nazl Legnaro, Viale Univ 2, I-35020 Legnaro, Italy..
    Grave, X.
    Inst Phys Nucl, F-91400 Orsay, France..
    Grebosz, J.
    Polish Acad Sci, Inst Nucl Phys, PL-31342 Krakow, Poland..
    Gorgen, A.
    Univ Oslo, Dept Phys, N-0316 Oslo, Norway..
    Gulmini, M.
    Ist Nazl Fis Nucl, Lab Nazl Legnaro, Viale Univ 2, I-35020 Legnaro, Italy..
    Habermann, T.
    GSI Helmholtzzentrum Schwerionenforsch GmbH, D-64291 Darmstadt, Germany..
    Hess, H.
    Univ Cologne, Inst Kernphys, Zulpicher Str 77, D-50937 Cologne, Germany..
    Isocrate, R.
    Ist Nazl Fis Nucl, Sez Padova, I-35131 Padua, Italy.;Univ Padua, Dipartimento Fis & Astron, I-35131 Padua, Italy..
    Iwanicki, J.
    Univ Warsaw, Heavy Ion Lab, Pasteura 5A, PL-02093 Warsaw, Poland..
    Jaworski, G.
    Univ Warsaw, Heavy Ion Lab, Pasteura 5A, PL-02093 Warsaw, Poland..
    Judson, D. S.
    Univ Liverpool, Oliver Lodge Lab, Liverpool L69 7ZE, Merseyside, England..
    Jungclaus, A.
    CSIC, Inst Estruct Mat, E-28006 Madrid, Spain..
    Karkour, N.
    CSNSM IN2P3 CNRS, F-91405 Orsay, France..
    Kmiecik, M.
    Polish Acad Sci, Inst Nucl Phys, PL-31342 Krakow, Poland..
    Karpinski, D.
    Univ Warsaw, Fac Phys, PL-00681 Warsaw, Poland..
    Kisielinski, M.
    Univ Warsaw, Heavy Ion Lab, Pasteura 5A, PL-02093 Warsaw, Poland..
    Kondratyev, N.
    Flerov Lab Nucl React JINR, RU-141980 Dubna, Russia..
    Korichi, A.
    CSNSM IN2P3 CNRS, F-91405 Orsay, France..
    Komorowska, M.
    Univ Warsaw, Heavy Ion Lab, Pasteura 5A, PL-02093 Warsaw, Poland.;Univ Warsaw, Fac Phys, PL-00681 Warsaw, Poland..
    Kowalczyk, M.
    Univ Warsaw, Heavy Ion Lab, Pasteura 5A, PL-02093 Warsaw, Poland..
    Korten, W.
    CEA Saclay, IRFU SPhN, F-91191 Gif Sur Yvette, France..
    Krzysiek, M.
    Polish Acad Sci, Inst Nucl Phys, PL-31342 Krakow, Poland..
    Lehaut, G.
    Univ Lyon 1, CNRS, IPN Lyon, IN2P3, F-69622 Villeurbanne, France..
    Leoni, S.
    Univ Milan, Dipartimento Fis & Astron, I-20133 Milan, Italy.;Ist Nazl Fis Nucl, Sez Milano, I-20133 Milan, Italy..
    Ljungvall, J.
    CSNSM IN2P3 CNRS, F-91405 Orsay, France..
    Lopez-Martens, A.
    CSNSM IN2P3 CNRS, F-91405 Orsay, France..
    Lunardi, S.
    Ist Nazl Fis Nucl, Sez Padova, I-35131 Padua, Italy.;Univ Padua, Dipartimento Fis & Astron, I-35131 Padua, Italy..
    Maron, G.
    Ist Nazl Fis Nucl, Lab Nazl Legnaro, Viale Univ 2, I-35020 Legnaro, Italy..
    Mazurek, K.
    Polish Acad Sci, Inst Nucl Phys, PL-31342 Krakow, Poland..
    Menegazzo, R.
    Ist Nazl Fis Nucl, Sez Padova, I-35131 Padua, Italy.;Univ Padua, Dipartimento Fis & Astron, I-35131 Padua, Italy..
    Mengoni, D.
    Ist Nazl Fis Nucl, Sez Padova, I-35131 Padua, Italy..
    Merchan, E.
    GSI Helmholtzzentrum Schwerionenforsch GmbH, D-64291 Darmstadt, Germany.;Tech Univ Darmstadt, D-64289 Darmstadt, Germany..
    Eczynski, W. M.
    Polish Acad Sci, Inst Nucl Phys, PL-31342 Krakow, Poland..
    Michelagnoli, C.
    Ist Nazl Fis Nucl, Sez Padova, I-35131 Padua, Italy.;Univ Padua, Dipartimento Fis & Astron, I-35131 Padua, Italy..
    Mierzejewski, J.
    Univ Warsaw, Heavy Ion Lab, Pasteura 5A, PL-02093 Warsaw, Poland..
    Million, B.
    Univ Milan, Dipartimento Fis & Astron, I-20133 Milan, Italy..
    Myalski, S.
    Polish Acad Sci, Inst Nucl Phys, PL-31342 Krakow, Poland..
    Napoli, D. R.
    Ist Nazl Fis Nucl, Lab Nazl Legnaro, Viale Univ 2, I-35020 Legnaro, Italy..
    Nicolini, R.
    Univ Milan, Dipartimento Fis & Astron, I-20133 Milan, Italy..
    Niikura, M.
    Inst Phys Nucl, F-91400 Orsay, France..
    Obertelli, A.
    CEA Saclay, IRFU SPhN, F-91191 Gif Sur Yvette, France..
    Ozmen, S. F.
    Univ Warsaw, Heavy Ion Lab, Pasteura 5A, PL-02093 Warsaw, Poland..
    Palacz, M.
    Univ Warsaw, Heavy Ion Lab, Pasteura 5A, PL-02093 Warsaw, Poland..
    Prochniak, L.
    Univ Warsaw, Heavy Ion Lab, Pasteura 5A, PL-02093 Warsaw, Poland..
    Pullia, A.
    Univ Milan, Dipartimento Fis & Astron, I-20133 Milan, Italy.;Ist Nazl Fis Nucl, Sez Milano, I-20133 Milan, Italy..
    Quintana, B.
    Univ Salamanca, Dept Fis Fundamental, Lab Radiac Ionizantes, E-37008 Salamanca, Spain..
    Rampazzo, G.
    Ist Nazl Fis Nucl, Lab Nazl Legnaro, Viale Univ 2, I-35020 Legnaro, Italy..
    Recchia, F.
    Ist Nazl Fis Nucl, Sez Padova, I-35131 Padua, Italy.;Univ Padua, Dipartimento Fis & Astron, I-35131 Padua, Italy..
    Redon, N.
    Univ Lyon 1, CNRS, IPN Lyon, IN2P3, F-69622 Villeurbanne, France..
    Reiter, P.
    Univ Cologne, Inst Kernphys, Zulpicher Str 77, D-50937 Cologne, Germany..
    Rosso, D.
    Ist Nazl Fis Nucl, Lab Nazl Legnaro, Viale Univ 2, I-35020 Legnaro, Italy..
    Rusek, K.
    Univ Warsaw, Heavy Ion Lab, Pasteura 5A, PL-02093 Warsaw, Poland..
    Sahin, E.
    Ist Nazl Fis Nucl, Lab Nazl Legnaro, Viale Univ 2, I-35020 Legnaro, Italy..
    Salsac, M. -D
    CEA Saclay, IRFU SPhN, F-91191 Gif Sur Yvette, France.
    Söderström, Per-Anders
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi.
    Stefan, I.
    Inst Phys Nucl, F-91400 Orsay, France..
    Stezowski, O.
    Univ Lyon 1, CNRS, IPN Lyon, IN2P3, F-69622 Villeurbanne, France..
    Styczen, J.
    Polish Acad Sci, Inst Nucl Phys, PL-31342 Krakow, Poland..
    Theisen, Ch.
    CEA Saclay, IRFU SPhN, F-91191 Gif Sur Yvette, France..
    Toniolo, N.
    Ist Nazl Fis Nucl, Lab Nazl Legnaro, Viale Univ 2, I-35020 Legnaro, Italy..
    Ur, C. A.
    Ist Nazl Fis Nucl, Sez Padova, I-35131 Padua, Italy.;Univ Padua, Dipartimento Fis & Astron, I-35131 Padua, Italy..
    Vandone, V.
    Univ Milan, Dipartimento Fis & Astron, I-20133 Milan, Italy.;Ist Nazl Fis Nucl, Sez Milano, I-20133 Milan, Italy..
    Wadsworth, R.
    Univ York, Dept Phys, York YO10 5DD, N Yorkshire, England..
    Wasilewska, B.
    Polish Acad Sci, Inst Nucl Phys, PL-31342 Krakow, Poland..
    Wiens, A.
    Univ Cologne, Inst Kernphys, Zulpicher Str 77, D-50937 Cologne, Germany..
    Wood, J. L.
    Georgia Inst Technol, Sch Phys, Atlanta, GA 30332 USA..
    Wrzosek-Lipska, K.
    Univ Warsaw, Heavy Ion Lab, Pasteura 5A, PL-02093 Warsaw, Poland..
    Zieblinski, M.
    Polish Acad Sci, Inst Nucl Phys, PL-31342 Krakow, Poland..
    Superdeformed and Triaxial States in Ca-422016Inngår i: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 117, nr 6, artikkel-id 062501Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Shape parameters of a weakly deformed ground-state band and highly deformed slightly triaxial sideband in Ca-42 were determined from E2 matrix elements measured in the first low-energy Coulomb excitation experiment performed with AGATA. The picture of two coexisting structures is well reproduced by new state-of-the-art large-scale shell model and beyond-mean-field calculations. Experimental evidence for superdeformation of the band built on 0(2)(+) has been obtained and the role of triaxiality in the A similar to 40 mass region is discussed. Furthermore, the potential of Coulomb excitation as a tool to study superdeformation has been demonstrated for the first time.

  • 374.
    Hall, Jan-Ove
    et al.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för astronomi och rymdfysik. Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutet för rymdfysik, Uppsalaavdelningen.
    Eriksson, Anders
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutet för rymdfysik, Uppsalaavdelningen.
    Leyser, Thomas
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutet för rymdfysik, Uppsalaavdelningen.
    Excitation of localized rotating waves in plasma density cavities by scattering of fast magnetosonic waves2004Inngår i: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 92, nr 25 pt.1, s. 255002-Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    An analytic description of electromagnetic waves in an inhomogeneous plasma is applied to investigate excitation of localized rotating waves below the lower hybrid frequency through scattering of fast magnetosonic waves on a density cavity. The magnetosonic wave is focused to left-handed rotating oscillations. We find the amplitude of the localized oscillations, resonance frequencies, and the width of the resonances. The theory is relevant for the lower hybrid solitary structures observed in space plasmas and is shown to be consistent with observations by the Freja satellite.

  • 375.
    Hau-Riege, S. P.
    et al.
    Center for Free-Electron Laser Science, Deutsches Elektronen-Synchrotron Notkestraße 85, DE-22607 Hamburg, Germany.
    Chapman, H. N.
    Kuba, J.
    Spiller, E.
    Baker, S.
    Bionta, R.
    Sokolowski-Tinten, K.
    Stojanovic, N.
    Kjornrattanawanich, B.
    Gullikson, E.
    Plonjes, E.
    Toleikis, S.
    Krzywinski, J.
    Tschentscher, T.
    Sobierajski, R.
    Bajt, S.
    London, R. A.
    Bergh, Magnus
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för cell- och molekylärbiologi.
    Caleman, Carl
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för cell- och molekylärbiologi.
    Nietubyc, R.
    Juha, L.
    Tschentscher, Thomas
    Force Field Benchmark of Organic Liquids: Density, Enthalpy of Vaporization, Heat Capacities, Surface Tension, Isothermal Compressibility, Volumetric Expansion Coefficient, and Dielectric Constant2007Inngår i: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 98, nr 14, s. 145502-Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    At the recently built FLASH x-ray free-electron laser, we studied the reflectivity of Si/C multilayers with fluxes up to 3×1014W/cm2. Even though the nanostructures were ultimately completely destroyed, we found that they maintained their integrity and reflectance characteristics during the 25-fs-long pulse, with no evidence for any structural changes over lengths greater than 3Å. This experiment demonstrates that with intense ultrafast pulses, structural damage does not occur during the pulse, giving credence to the concept of diffraction imaging of single macromolecules.

  • 376. Hau-Riege, Stefan P.
    et al.
    Boutet, Sebastien
    Barty, Anton
    Bajt, Sasa
    Bogan, Michael J.
    Frank, Matthias
    Andreasson, Jakob
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för cell- och molekylärbiologi, Molekylär biofysik.
    Iwan, Bianca
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för cell- och molekylärbiologi, Molekylär biofysik.
    Seibert, M. Marvin
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för cell- och molekylärbiologi, Molekylär biofysik.
    Hajdu, Janos
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för cell- och molekylärbiologi, Molekylär biofysik.
    Sakdinawat, Anne
    Schulz, Joachim
    Treusch, Rolf
    Chapman, Henry N.
    Sacrificial Tamper Slows Down Sample Explosion in FLASH Diffraction Experiments2010Inngår i: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 104, nr 6, s. 064801-Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Intense and ultrashort x-ray pulses from free-electron lasers open up the possibility for near-atomic resolution imaging without the need for crystallization. Such experiments require high photon fluences and pulses shorter than the time to destroy the sample. We describe results with a new femtosecond pump-probe diffraction technique employing coherent 0.1 keV x rays from the FLASH soft x-ray free-electron laser. We show that the lifetime of a nanostructured sample can be extended to several picoseconds by a tamper layer to dampen and quench the sample explosion, making <1 nm resolution imaging feasible.

  • 377. Hau-Riege, Stefan P.
    et al.
    London, Richard A.
    Chapman, Henry N.
    Szöke, Abraham
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för cell- och molekylärbiologi, Molekylär biofysik.
    Timneanu, Nicusor
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för cell- och molekylärbiologi.
    Encapsulation and diffraction-pattern-correction methods to reduce the effect of damage in x-ray diffraction imaging of single biological molecules2007Inngår i: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 98, nr 19, s. 198302-Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Short and intense x-ray pulses may be used for atomic-resolution diffraction imaging of single biological molecules. Radiation damage and a low signal-to-noise ratio impose stringent pulse requirements. In this Letter, we describe methods for decreasing the damage and improving the signal by encapsulating the molecule in a sacrificial layer (tamper) that reduces atomic motion and by postprocessing the pulse-averaged diffraction pattern to correct for ionization damage. Simulations show that these methods greatly improve the image quality.

  • 378. Hazarika, Abhijit
    et al.
    Layek, Arunasish
    De, Suman
    Nag, Angshuman
    Debnath, Saikat
    Mahadevan, Priya
    Chowdhury, Arindam
    Sarma, Dipankar Das
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Molekyl- och kondenserade materiens fysik.
    Ultranarrow and Widely Tunable Mn2+-Induced Photoluminescence from Single Mn-Doped Nanocrystals of ZnS-CdS Alloys2013Inngår i: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 110, nr 26, s. 267401-Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Extensively studied Mn-doped semiconductor nanocrystals have invariably exhibited photoluminescence over a narrow energy window of width <= 150 meV in the orange-red region and a surprisingly large spectral width (>= 180 meV), contrary to its presumed atomic-like origin. Carrying out emission measurements on individual single nanocrystals and supported by ab initio calculations, we show that Mn PL emission, in fact, can (i) vary over a much wider range (similar to 370 meV) covering the deep green-deep red region and (ii) exhibit widths substantially lower (similar to 60-75 meV) than reported so far, opening newer application possibilities and requiring a fundamental shift in our perception of the emission from Mn-doped semiconductor nanocrystals.

  • 379.
    He, Song
    et al.
    Chinese Acad Sci, Inst Theoret Phys, CAS Key Lab Theoret Phys, Beijing 100190, Peoples R China;Univ Chinese Acad Sci, Sch Phys Sci, 19A Yuquan Rd, Beijing 100049, Peoples R China.
    Teng, Fei
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Teoretisk fysik.
    Zhang, Yong
    Chinese Acad Sci, Inst Theoret Phys, CAS Key Lab Theoret Phys, Beijing 100190, Peoples R China;Univ Chinese Acad Sci, Sch Phys Sci, 19A Yuquan Rd, Beijing 100049, Peoples R China.
    String Amplitudes from Field-Theory Amplitudes and Vice Versa2019Inngår i: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 122, nr 21, artikkel-id 211603Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    We present an integration-by-parts reduction of any massless tree-level string correlator to an equivalence class of logarithmic finzctions, which can be used to define a field-theory amplitude via a Cachazo-He-Yuan (CHY) formula. The string amplitude is then shown to be the double copy of the field theory one and a special disk or sphere integral. The construction is generic as it applies to any correlator that is a rational function of correct SL(2) weight. By applying the reduction to open bosonic or heterotic strings, we get a closed-form CHY integrand for the (DF)(2) + Yang-Mills + phi(3) theory.

  • 380. Hellman, O.
    et al.
    Skorodumova, Natalia V.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Materialteori.
    Simak, S. I.
    Charge Redistribution Mechanisms of Ceria Reduction2012Inngår i: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 108, nr 13, s. 135504-Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Charge redistribution at low oxygen vacancy concentrations in ceria have been studied in the framework of the density functional theory. We propose a model to approach the dilute limit using the results of supercell calculations. It allows one to reproduce the characteristic experimentally observed behavior of composition versus oxygen pressure dependency. We show that in the dilute limit the charge redistribution is likely to be driven by a mechanism different from the one involving electron localization on cerium atoms. We demonstrate that it can involve charge localization on light element impurities.

  • 381.
    Hennies, Franz
    et al.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Mjukröntgenfysik.
    Pietzsch, Annette
    Berglund, Martin
    Föhlisch, Alexander
    Schmitt, Thorsten
    Strocov, Vladimir
    Karlsson, Hans O.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Kemiska sektionen, Institutionen för fysikalisk och analytisk kemi, Kvantkemi.
    Andersson, Joakim
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Mjukröntgenfysik.
    Rubensson, Jan-Erik
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Mjukröntgenfysik.
    Resonant Inelastic Scattering Spectra of Free Molecules with Vibrational Resolution2010Inngår i: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 104, nr 19, s. 193002-Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Inelastic x-ray scattering spectra excited at the 1s(-1) pi* resonance of gas phase O-2 have been recorded with an overall energy resolution that allows for well-resolved vibrational progressions. The nuclear wave packet dynamics in the intermediate state is reflected in vibrational excitations of the electronic ground state, and by fine-tuning the excitation energy the dissociation dynamics in the predissociative B' (3) Pi(g) final state is controlled.

  • 382. Hietala, H.
    et al.
    Laitinen, Tiera V.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutet för rymdfysik, Uppsalaavdelningen.
    Andreeova, K.
    Vainio, R.
    Vaivads, Andris
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutet för rymdfysik, Uppsalaavdelningen.
    Palmroth, M.
    Pulkkinen, T. I.
    Koskinen, H. E. J.
    Lucek, E. A.
    Reme, H.
    Supermagnetosonic Jets behind a Collisionless Quasiparallel Shock2009Inngår i: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 103, nr 24, s. 245001-Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The downstream region of a collisionless quasiparallel shock is structured containing bulk flows with high kinetic energy density from a previously unidentified source. We present Cluster multispacecraft measurements of this type of supermagnetosonic jet as well as of a weak secondary shock front within the sheath, that allow us to propose the following generation mechanism for the jets: The local curvature variations inherent to quasiparallel shocks can create fast, deflected jets accompanied by density variations in the downstream region. If the speed of the jet is super(magneto)sonic in the reference frame of the obstacle, a second shock front forms in the sheath closer to the obstacle. Our results can be applied to collisionless quasiparallel shocks in many plasma environments.

  • 383. Hikosaka, Y.
    et al.
    Lablanquie, P.
    Penent, F.
    Kaneyasu, T.
    Shigemasa, E.
    Feifel, R.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och materialvetenskap, Mjukröntgenfysik.
    Eland, J. H. D.
    Ito, K.
    Energy Correlation of the Three Electrons Emitted during the Triple Photoionization of Ar2009Inngår i: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 102, nr 1, s. 013002-Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    We report on an experimental investigation of energy correlation among three electrons emitted in valence triple photoionization (TPI) of Ar. The energy correlations reveal a predominant contribution from sequential TPI processes involving intermediate Ar2+ formation, which suggests that such indirect contributions should be included in the formulation of the threshold law for TPI cross sections. The differential cross section for direct TPI at about 150 eV above threshold producing one slow electron with a few eV kinetic energy is found to have a deeply hollow U-shaped profile in energy sharing between the other two electrons.

  • 384. Hild, K.
    et al.
    Maul, J.
    Schoenhense, G.
    Elmers, H. J.
    Amft, Martin
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och materialvetenskap.
    Oppeneer, Peter M.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och materialvetenskap.
    Magnetic Circular Dichroism in Two-Photon Photoemission2009Inngår i: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 102, nr 5, s. 057207-Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    We report the observation of magnetic circular dichroism (MCD) in two-photon photoemission (2PPE). The Heusler alloys Ni2MnGa and Co2FeSi were investigated by excitation with femtosecond laser light, showing MCD asymmetries of A = (3.5 +/- 0.5) x 10(-3) for Ni2MnGa and of A = (2.1 +/- 1.0) x 10(-3) for Co2FeSi, respectively. A theoretical explanation is provided based on local spin-density calculations for the magnetic dichroic response; the computed 2PPE MCD agrees well with the experiment. The observed 2PPE magnetic contrast represents an interesting alternative for future time-resolved photoemission studies on surface magnetism practicable in the laboratory.

  • 385. Hillyard, P. B.
    et al.
    Gaffney, K. J.
    Lindenberg, A. M.
    Engemann, S.
    Akre, R. A.
    Arthur, J.
    Blome, C.
    Bucksbaum, P. H.
    Cavalieri, A. L.
    Deb, A.
    Falcone, R. W.
    Fritz, D. M.
    Fuoss, P. H.
    Hajdu, Janos
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för cell- och molekylärbiologi.
    Krejcik, P.
    Larsson, J.
    Lee, S. H.
    Meyer, D. A.
    Nelson, A. J.
    Pahl, R.
    Reis, D. A.
    Rudati, J.
    Siddons, D. P.
    Sokolowski-Tinten, K.
    von der Linde, D.
    Hastings, J. B.
    Carrier-density-dependent lattice stability in InSb2007Inngår i: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 98, nr 12, s. 125501-Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The ultrafast decay of the x-ray diffraction intensity following laser excitation of an InSb crystal has been utilized to observe carrier dependent changes in the potential energy surface. For the first time, an abrupt carrier dependent onset for potential energy surface softening and the appearance of accelerated atomic disordering for a very high average carrier density have been observed. Inertial dynamics dominate the early stages of crystal disordering for a wide range of carrier densities between the onset of crystal softening and the appearance of accelerated atomic disordering.

  • 386.
    Hobein, Matthias
    et al.
    Stockholms universitet, Fysikum.
    Solders, Andreas
    Stockholms universitet, Fysikum.
    Suhonen, Markus
    Stockholms universitet, Fysikum.
    Liu, Yuwen
    Stockholms universitet, Fysikum.
    Schuch, Reinhold
    Stockholms universitet, Fysikum.
    Evaporative Cooling and Coherent Axial Oscillations of Highly Charged Ions in a Penning Trap2011Inngår i: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 106, nr 1, s. 013002-Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Externally, in an electron beam ion trap, generated Ar16+ ions were retrapped in a Penning trap and evaporatively cooled in their axial motion. The cooling was observed by a novel extraction technique based on the excitation of a coherent axial oscillation which yields short ion bunches of well-defined energies. The initial temperature of the ion cloud was decreased by a factor of more than 140 within 1 s, while the phase-space density of the coldest extracted ion pulses was increased by a factor of up to about 9.

  • 387.
    Hoferichter, Martin
    et al.
    Univ Washington, Inst Nucl Theory, Seattle, WA USA.
    Hoid, Bai-Long
    Univ Bonn, Helmholtz Inst Strahlen & Kernphys Theory, Bonn, Germany; Univ Bonn, Bethe Ctr Theoret Phys, Bonn, Germany.
    Kubis, Bastian
    Univ Bonn, Helmholtz Inst Strahlen & Kernphys Theory, Bonn, Germany; Univ Bonn, Bethe Ctr Theoret Phys, Bonn, Germany.
    Leupold, Stefan
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Kärnfysik.
    Schneider, Sebastian P.
    Univ Bonn, Helmholtz Inst Strahlen & Kernphys Theory, Bonn, Germany; Univ Bonn, Bethe Ctr Theoret Phys, Bonn, Germany.
    Pion-Pole Contribution to Hadronic Light-By-Light Scattering in the Anomalous Magnetic Moment of the Muon2018Inngår i: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 121, nr 11, artikkel-id 112002Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The pi(0) pole constitutes the lowest-lying singularity of the hadronic light-by-light (HLBL) tensor, and thus, it provides the leading contribution in a dispersive approach to HLBL scattering in the anomalous magnetic moment of the muon (g - 2)(mu). It is unambiguously defined in terms of the doubly virtual pion transition form factor, which in principle, can be accessed in its entirety by experiment. We demonstrate that, in the absence of a direct measurement, the full spacelike doubly virtual form factor can be reconstructed very accurately based on existing data for e(+)e(-) -> 3 pi, e(+)e(-)-> e(+)e(-)pi(0), and the pi(0) -> gamma gamma decay width. We derive a representation that incorporates all the low-lying singularities of the form factor, matches correctly onto the asymptotic behavior expected from perturbative QCD, and is suitable for the evaluation of the (g - 2)(mu) loop integral. The resulting value, a(mu)(pi 0-pole) = 62.6(-2.5)(+3.0) x 10(-11), for the first time, represents a complete data-driven determination of the pion-pole contribution with fully controlled uncertainty estimates. In particular, we show that already improved singly virtual measurements alone would allow one to further reduce the uncertainty in a(mu)(pi 0-pole).

  • 388. Holmström, E.
    et al.
    Olovsson, W.
    Abrikosov, I. A.
    Niklasson, A. M. N.
    Johansson, B.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Fysiska institutionen.
    Gorgoi, M.
    Karis, Olof
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Fysiska institutionen.
    Svensson, S.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Fysiska institutionen.
    Schäfers, F.
    Braun, W.
    Öhrwall, Gunnar
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Fysiska institutionen.
    Andersson, Gabriella
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Fysiska institutionen.
    Marcellini, Moreno
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Fysiska institutionen.
    Eberhardt, W.
    Sample preserving deep interface characterization technique2006Inngår i: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 97, nr 26, artikkel-id 266106Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    We propose a nondestructive technique based on atomic core-level shifts to characterize the interface quality of thin film nanomaterials. Our method uses the inherent sensitivity of the atomic core-level binding energies to their local surroundings in order to probe the layer-resolved binary alloy composition profiles at deeply embedded interfaces. From an analysis based upon high energy x-ray photoemission spectroscopy and density functional theory of a Ni/Cu fcc (100) model system, we demonstrate that this technique is a sensitive tool to characterize the sharpness of a buried interface. We performed controlled interface tuning by gradually approaching the diffusion temperature of the multilayer, which lead to intermixing. We show that core-level spectroscopy directly reflects the changes in the electronic structure of the buried interfaces, which ultimately determines the functionality of the nanosized material.

  • 389.
    Horio, M.
    et al.
    Univ Zurich, Phys Inst, Winterthurerstr 190, CH-8057 Zurich, Switzerland.
    Hauser, K.
    Univ Zurich, Phys Inst, Winterthurerstr 190, CH-8057 Zurich, Switzerland.
    Sassa, Yasmine
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Molekyl- och kondenserade materiens fysik.
    Mingazheva, Z.
    Univ Zurich, Phys Inst, Winterthurerstr 190, CH-8057 Zurich, Switzerland.
    Sutter, D.
    Univ Zurich, Phys Inst, Winterthurerstr 190, CH-8057 Zurich, Switzerland.
    Kramer, K.
    Univ Zurich, Phys Inst, Winterthurerstr 190, CH-8057 Zurich, Switzerland.
    Cook, A.
    Univ Zurich, Phys Inst, Winterthurerstr 190, CH-8057 Zurich, Switzerland.
    Nocerino, E.
    KTH Royal Inst Technol, Dept Appl Phys, Electrum 229, SE-16440 Stockholm, Sweden.
    Forslund, O. K.
    KTH Royal Inst Technol, Dept Appl Phys, Electrum 229, SE-16440 Stockholm, Sweden.
    Tjernberg, O.
    KTH Royal Inst Technol, Dept Appl Phys, Electrum 229, SE-16440 Stockholm, Sweden.
    Kobayashi, M.
    Paul Scherrer Inst, Swiss Light Source, CH-5232 Villigen, Switzerland.
    Chikina, A.
    Paul Scherrer Inst, Swiss Light Source, CH-5232 Villigen, Switzerland.
    Schröter, N. B. M.
    Paul Scherrer Inst, Swiss Light Source, CH-5232 Villigen, Switzerland.
    Krieger, J. A.
    Paul Scherrer Inst, Lab Muon Spin Spect, CH-5232 Villigen, Switzerland;Swiss Fed Inst Technol, Lab Festkorperphys, CH-8093 Zurich, Switzerland.
    Schmitt, T.
    Paul Scherrer Inst, Swiss Light Source, CH-5232 Villigen, Switzerland.
    Strocov, V. N.
    Paul Scherrer Inst, Swiss Light Source, CH-5232 Villigen, Switzerland.
    Pyon, S.
    Univ Tokyo, Dept Adv Mat, Kashiwa, Chiba 2778561, Japan.
    Takayama, T.
    Univ Tokyo, Dept Adv Mat, Kashiwa, Chiba 2778561, Japan.
    Takagi, H.
    Univ Tokyo, Dept Adv Mat, Kashiwa, Chiba 2778561, Japan.
    Lipscombe, O. J.
    Univ Bristol, HH Wills Phys Lab, Bristol BS8 1TL, Avon, England.
    Hayden, S. M.
    Univ Bristol, HH Wills Phys Lab, Bristol BS8 1TL, Avon, England.
    Ishikado, M.
    CROSS, Tokai, Ibaraki 3191106, Japan.
    Eisaki, H.
    Natl Inst Adv Ind Sci & Technol, Elect & Photon Res Inst, Tsukuba 3058568, Japan.
    Neupert, T.
    Univ Zurich, Phys Inst, Winterthurerstr 190, CH-8057 Zurich, Switzerland.
    Månsson, M.
    KTH Royal Inst Technol, Dept Appl Phys, Electrum 229, SE-16440 Stockholm, Sweden.
    Matt, C. E.
    Univ Zurich, Phys Inst, Winterthurerstr 190, CH-8057 Zurich, Switzerland;Paul Scherrer Inst, Swiss Light Source, CH-5232 Villigen, Switzerland;Harvard Univ, Dept Phys, Cambridge, MA 02138 USA.
    Chang, J.
    Univ Zurich, Phys Inst, Winterthurerstr 190, CH-8057 Zurich, Switzerland.
    Three-Dimensional Fermi Surface of Overdoped La-Based Cuprates2018Inngår i: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 121, nr 7, artikkel-id 077004Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    We present a soft x-ray angle-resolved photoemission spectroscopy study of overdoped high-temperature superconductors. In-plane and out-of-plane components of the Fermi surface are mapped by varying the photoemission angle and the incident photon energy. No k(z) dispersion is observed along the nodal direction, whereas a significant antinodal k(z) dispersion is identified for La-based cuprates. Based on a tight-binding parametrization, we discuss the implications for the density of states near the van Hove singularity. Our results suggest that the large electronic specific heat found in overdoped La2-xSrxCuO4 cannot be assigned to the van Hove singularity alone. We therefore propose quantum criticality induced by a collapsing pseudogap phase as a plausible explanation for observed enhancement of electronic specific heat.

  • 390. Hossain, M. A.
    et al.
    Hu, Z.
    Haverkort, M. W.
    Burnus, T.
    Chang, C. F.
    Klein, S.
    Denlinger, J. D.
    Lin, H.-J.
    Chen, C. T.
    Mathieu, Roland
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Tekniska sektionen, Institutionen för teknikvetenskaper, Fasta tillståndets fysik.
    Kaneko, Y.
    Tokura, Y.
    Satow, S.
    Yoshida, Y.
    Takagi, H.
    Tanaka, A.
    Elfimov, I. S.
    Sawatzky, G. A.
    Tjeng, L. H.
    Damascelli, A.
    Crystal-field level inversion in lightly Mn-doped Sr3Ru2O72008Inngår i: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 101, nr 1, s. 016404-Artikkel i tidsskrift (Fagfellevurdert)
  • 391.
    Hyllus, Philipp
    et al.
    Institut für Theoretische Physik, Universität Hannover, Germany.
    Sjöqvist, Erik
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Kemiska sektionen, Institutionen för kvantkemi.
    Comment on `Complementarity between Local and Nonlocal Topological Effects'2002Inngår i: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 89, nr 19, s. 198901-Artikkel i tidsskrift (Annet vitenskapelig)
  • 392.
    Höglund, Andreas
    et al.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Fysiska institutionen, Kondenserade materiens teori (Fysik IV).
    Eriksson, Olle
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Fysiska institutionen, Kondenserade materiens teori (Fysik IV).
    Castleton, Christopher
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Kemiska sektionen, Institutionen för materialkemi, Strukturkemi.
    Mirbt, Susanne
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Fysiska institutionen, Kondenserade materiens teori (Fysik IV).
    Increasing the equilibrium solubility of dopants in semiconductor multilayers and alloys2008Inngår i: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 100, nr 10, s. 105501-Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    We have theoretically studied the possibility to control the equilibrium solubility of dopants in semiconductor alloys, by strategic tuning of the alloy concentration. From the modeled cases of C-0 in SixGe1-x, Zn- and Cd- in GaxIn1-xP it is seen that under certain conditions the dopant solubility can be orders of magnitude higher in an alloy or multilayer than in either of the elements of the alloy. This is found to be due to the solubility's strong dependence on the lattice constant for size mismatched dopants. The equilibrium doping concentration in alloys or multilayers could therefore be increased significantly. More specifically, Zn- in a GaxIn1-xP multilayer is found to have a maximum solubility for x=0.9, which is 5 orders of magnitude larger than that of pure InP.

  • 393. Ingason, A. S.
    et al.
    Mockute, A.
    Dahlqvist, M.
    Magnus, Fridrik
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Materialfysik.
    Olafsson, S.
    Arnalds, Unnar B.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Materialfysik.
    Alling, B.
    Abrikosov, I. A.
    Hjörvarsson, Björgvin
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Materialfysik.
    Persson, P. O. A.
    Rosen, J.
    Magnetic Self-Organized Atomic Laminate from First Principles and Thin Film Synthesis2013Inngår i: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 110, nr 19, s. 195502-Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The first experimental realization of a magnetic M(n+1)AX(n) (MAX) phase, (Cr0.75Mn0.25)(2)GeC, is presented, synthesized as a heteroepitaxial single crystal thin film, exhibiting excellent structural quality. This self-organized atomic laminate is based on the well-known Cr2GeC, with Mn, a new element in MAX phase research, substituting Cr. The compound was predicted using first-principles calculations, from which a variety of magnetic behavior is envisaged, depending on the Mn concentration and Cr/Mn atomic configuration within the sublattice. The analyzed thin films display a magnetic signal at room temperature.

  • 394.
    Iwayama, H.
    et al.
    Inst Mol Sci, UVSOR Synchrotron Facil, Okazaki, Aichi 4448585, Japan..
    Leonard, C.
    Univ Paris Est Marne la Vallee, Lab Modelisat & Simulat Multi Echelle UMR CNRS 82, F-77454 Marne La Vallee, France..
    Le Quere, F.
    Univ Paris Est Marne la Vallee, Lab Modelisat & Simulat Multi Echelle UMR CNRS 82, F-77454 Marne La Vallee, France..
    Carniato, S.
    UPMC Univ Paris 6, Sorbonne Univ, CNRS, Lab Chim Phys Matiere & Rayonnement,UMR 7614, F-75005 Paris, France..
    Guillemin, R.
    UPMC Univ Paris 6, Sorbonne Univ, CNRS, Lab Chim Phys Matiere & Rayonnement,UMR 7614, F-75005 Paris, France..
    Simon, M.
    UPMC Univ Paris 6, Sorbonne Univ, CNRS, Lab Chim Phys Matiere & Rayonnement,UMR 7614, F-75005 Paris, France..
    Piancastelli, Maria Novella
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Molekyl- och kondenserade materiens fysik. UPMC Univ Paris 6, Sorbonne Univ, CNRS, Lab Chim Phys Matiere & Rayonnement,UMR 7614, F-75005 Paris, France.
    Shigemasa, E.
    Inst Mol Sci, UVSOR Synchrotron Facil, Okazaki, Aichi 4448585, Japan..
    Different Time Scales in the Dissociation Dynamics of Core-Excited CF4 by Two Internal Clocks2017Inngår i: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 119, nr 20, artikkel-id 203203Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Fragmentation processes following C 1s -> lowest unoccupied molecular orbital core excitations in CF4 have been analyzed on the ground of the angular distribution of the CF3+ emitted fragments by means of Auger electron-photoion coincidences. Different time scales have been enlightened, which correspond to either ultrafast fragmentation, on the few-femtosecond scale, where the molecule has no time to rotate and the fragments are emitted according to the maintained orientation of the core-excited species, or dissociation after resonant Auger decay, where the molecule still keeps some memory of the excitation process before reassuming random orientation. Potential energy surfaces of the ground, core-excited, and final states have been calculated at the ab initio level, which show the dissociative nature of the neutral excited state, leading to ultrafast dissociation, as well as the also dissociative nature of some of the final ionic states reached after resonant Auger decay, yielding the same fragments on a much longer time scale.

  • 395. Jankala, K.
    et al.
    Tchaplyguine, M.
    Mikkela, M.-H.
    Björneholm, Olle
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Yt- och gränsskiktsvetenskap.
    Huttula, M.
    Photon Energy Dependent Valence Band Response of Metallic Nanoparticles2011Inngår i: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 107, nr 18, s. 183401-Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    We show that the valence band response to photon impact in metallic nanoparticles is highly energy dependent. This is seen as drastic variations of cross sections in valence photoionization of free and initially charge-neutral nanosized metal clusters. The effect is demonstrated in a combined experimental and theoretical study of Rb clusters. The experimental findings are interpreted theoretically using a jellium model and superatom description. The variations are attributed to the changing overlap with the photon energy between the wave functions of diffuse delocalized valence electrons and continuum electrons producing a series of minima in the cross section.

  • 396.
    Johansson, Niklas
    et al.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Kemiska sektionen, Institutionen för kvantkemi.
    Sjöqvist, Erik
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Kemiska sektionen, Institutionen för kvantkemi.
    Optimal topological test for degeneracies of real Hamiltonians2004Inngår i: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 92, nr 6, s. 060406-Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    We consider adiabatic transport of eigenstates of real Hamiltonians around loops in parameter space. It is demonstrated that loops that map to nontrivial loops in the space of eigenbases must encircle degeneracies. Examples from Jahn-Teller theory are presented to illustrate the test. We show furthermore that the proposed test is optimal.

  • 397.
    Johlander, Andreas
    et al.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutet för rymdfysik, Uppsalaavdelningen. Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Rymd- och plasmafysik.
    Schwartz, S .J.
    Imperial Coll London, Blackett Lab, London SW7 2AZ, England; Univ Colorado, Lab Atmospher & Space Phys, Boulder, CO 80303 USA.
    Vaivads, Andris
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutet för rymdfysik, Uppsalaavdelningen.
    Khotyaintsev, Yuri V.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutet för rymdfysik, Uppsalaavdelningen.
    Gingell, I.
    Blackett Laboratory, Imperial College London, London SW7 2AZ, United Kingdom.
    Peng, I. B.
    KTH Royal Institute of Technology, Stockholm 11428, Sweden.
    Markidis, S.
    KTH Royal Institute of Technology, Stockholm 11428, Sweden.
    Lindqvist, P-A.
    KTH Royal Institute of Technology, Stockholm 11428, Sweden.
    Ergun, R. E.
    Laboratory of Atmospheric and Space Physics, University of Colorado, Boulder, Colorado 80303, USA.
    Marklund, G. T.
    KTH Royal Institute of Technology, Stockholm 11428, Sweden.
    Plaschke, F.
    Space Research Institute, Austrian Academy of Sciences, Graz 8042, Austria.
    Magnes, W.
    Space Research Institute, Austrian Academy of Sciences, Graz 8042, Austria.
    Strangeway, R. J.
    University of California, Los Angeles, California 90095, USA.
    Russell, C.T.
    University of California, Los Angeles, California 90095, USA.
    Wei, H.
    University of California, Los Angeles, California 90095, USA.
    Torbert, R. B.
    University of New Hampshire, Durham, New Hampshire 03824, USA.
    Paterson, W. R.
    NASA Goddard Space Flight Center, Greenbelt, Maryland 20771, USA.
    Gershman, D. J.
    NASA Goddard Space Flight Center, Greenbelt, Maryland 20771, USA; University of Maryland, College Park, Maryland 20742, USA.
    Dorelli, J. C.
    NASA Goddard Space Flight Center, Greenbelt, Maryland 20771, USA.
    Avanov, L. A.
    NASA Goddard Space Flight Center, Greenbelt, Maryland 20771, USA.
    Lavraud, B.
    Institut de Recherche en Astrophysique et Planétologie, Université de Toulouse, Toulouse 31028, France; Centre National de la Recherche Scientifique, UMR 5277, Toulouse 31400, France.
    Saito, Y.
    Institute of Space and Astronautical Science, JAXA, Sagamihara 2525210, Japan.
    Giles, B. L.
    NASA Goddard Space Flight Center, Greenbelt, Maryland 20771, USA.
    Pollock, C. J.
    NASA Goddard Space Flight Center, Greenbelt, Maryland 20771, USA.
    Burch, J. L.
    Southwest Research Institute, San Antonio, Texas 78238, USA.
    Rippled quasiperpendicularshock observed by the Magnetospheric Multiscale spacecraft2016Inngår i: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 117, nr 16, artikkel-id 165101Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Collisionless shock non-stationarity arising from micro-scale physics influences shock structure and particle acceleration mechanisms. Non-stationarity has been difficult to quantify due to the small spatial and temporal scales. We use the closely-spaced (sub-gyroscale), high time-resolution measurements from one rapid crossing of Earth's quasi-perpendicular bow shock by the Magnetospheric Multiscale (MMS) spacecraft to compare competing non-stationarity processes. Using MMS's high cadence kinetic plasma measurements, we show that the shock exhibits non-stationarity in the form of ripples.

  • 398. Jönsson, P. E.
    et al.
    Mathieu, Roland
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Tekniska sektionen, Institutionen för teknikvetenskaper, Fasta tillståndets fysik.
    Wernsdorfer, W.
    Tkachuk, A.
    Barbara, B.
    Absence of conventional spin-glass transition in the Ising dipolar system LiHoxY1-xF42007Inngår i: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 98, nr 25, s. 256403-Artikkel i tidsskrift (Fagfellevurdert)
  • 399. Jönsson, P. E.
    et al.
    Mathieu, Roland
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Tekniska sektionen, Institutionen för teknikvetenskaper, Fasta tillståndets fysik.
    Wernsdorfer, W.
    Tkachuk, A.
    Barbara, B.
    Comment on “Quantum and Classical GlassTransitions in LiHoxY1−xF4”Inngår i: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114Artikkel i tidsskrift (Fagfellevurdert)
  • 400.
    Jönsson, Petra
    et al.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Fysiska institutionen.
    Mathieu, Roland
    Wernsdorfer, W.
    Tkachuk, A. M.
    Barbara, B.
    Absence of conventional spin-glass transition in the ising dipolar system LiHoxY1-xF42007Inngår i: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 98, nr 25, s. 256403-Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The magnetic properties of single crystals of LiHoxY1-xF4 with x=16.5% and x=4.5% were recorded down to 35 mK using a micro-SQUID magnetometer. While this system is considered as the archetypal quantum spin glass, the detailed analysis of our magnetization data indicates the absence of a phase transition, not only in a transverse applied magnetic field, but also without field. A zero-Kelvin phase transition is also unlikely, as the magnetization seems to follow a noncritical exponential dependence on the temperature. Our analysis thus unmasks the true, short-ranged nature of the magnetic properties of the LiHoxY1-xF4 system, validating recent theoretical investigations suggesting the lack of phase transition in this system.

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