Angle-resolved photoemission study of dispersive and narrow-band 5f states in UAsSe
2006 (English)In: PHYSICAL REVIEW B, ISSN 1098-0121, Vol. 73, no 15, 155119- p.Article in journal (Refereed) Published
Single crystals of ferromagnetic UAsSe have been investigated by angle-resolved photoemission spectroscopy (ARPES) in the photon energy range between 20 eV and 110 eV. Electron kinetic energy intensities are collected as a function of angle and mapped onto the materials reciprocal space. Energy-band mapping has been carried out both for a several-eV-wide energy interval as well as for a narrow energy interval of less than 1 eV from the Fermi energy. The main features of the deduced energy bands can be explained by band-structure calculations. In the interval close to the Fermi energy, the very high energy and momentum resolution allows the observation of a narrow, yet dispersive photoemission peak mainly of 5f character situated within 50 meV of the Fermi energy. The Lorentzian linewidth was found to be about 35 meV with a dispersion of 30 meV along the Gamma to Z direction and 40 meV dispersion along the Gamma to X direction in the Brillouin zone. We have also found broader (linewidth about 70 meV), hybridized f-character bands with a conventional dispersion of about 1 eV along the Gamma to X and the Z to R directions in the Brillouin zone. An intriguing electronic structure emerges for UAsSe in which both relatively dispersive and narrow 5f bands are present. The occurrence of 5f-band dispersions stipulates that the electronic structure of UAsSe requires lattice periodicity to be taken into account.
Place, publisher, year, edition, pages
2006. Vol. 73, no 15, 155119- p.
ELECTRONIC-STRUCTURE, PHOTOELECTRON-SPECTROSCOPY, ELECTRICAL-RESISTIVITY, NEUTRON-DIFFRACTION, SINGLE-CRYSTALS, DELTA-PLUTONIUM, URANIUM, METALS, FERROMAGNETS, MAGNETISM
IdentifiersURN: urn:nbn:se:uu:diva-19331DOI: doi:10.1103/PhysRevB.73.155119OAI: oai:DiVA.org:uu-19331DiVA: diva2:47103