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Coherent charge and magnetic ordering in Ho/Y superlattice revealed by element-selective x-ray scattering
Paul Scherrer Inst, Lab Neutron Scattering & Imaging LNS, CH-5232 Villigen, Switzerland.
Natl Res Ctr, Kurchatov Inst, Petersburg Nucl Phys Inst, Gatchina 188300, Russia.
Natl Acad Sci Ukraine, Inst Magnetism, UA-03142 Kiev, Ukraine;Kiev Natl Univ, Inst High Technol, UA-03022 Kiev, Ukraine.
Helmholtz Zentrum Geesthacht, Inst Mat Res, Max Planck Str 1, D-21502 Geesthacht, Germany.
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2019 (English)In: Physical Review B, ISSN 2469-9950, E-ISSN 2469-9969, Vol. 100, no 13, article id 134417Article in journal (Refereed) Published
Abstract [en]

Magnetic rare-earth/nonmagnetic metal superlattices are well-known to display chiral spin helices in the rare-earth layers that propagate coherently across the nonmagnetic layers. However, the underlying mechanism that preserves the magnetic phase and chirality coherence across the nonmagnetic layers has remained elusive. In this paper, we use resonant and element-specific x-ray scattering to evidence directly the formation of two fundamentally different long-range modulations in a holmium/yttrium (Ho/Y) multilayer: the known Ho chiral spin helix with periodicity 25 angstrom and a newly observed charge density wave with periodicity 16 angstrom that propagates through both the Ho and nonmagnetic Y layer. With x-ray circular magnetic dichroism measurements ruling out the existence of a magnetic proximity effect induced moment in the nonmagnetic Y layers, we propose that the charge density wave is also chiral, thus providing the means for the transmittance of magnetic chirality coherence between Ho layers.

Place, publisher, year, edition, pages
AMER PHYSICAL SOC , 2019. Vol. 100, no 13, article id 134417
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Condensed Matter Physics
Identifiers
URN: urn:nbn:se:uu:diva-396712DOI: 10.1103/PhysRevB.100.134417ISI: 000489820500003OAI: oai:DiVA.org:uu-396712DiVA, id: diva2:1368847
Funder
Knut and Alice Wallenberg Foundation, 2015.0060Swedish Research CouncilThe Swedish Foundation for International Cooperation in Research and Higher Education (STINT)Available from: 2019-11-08 Created: 2019-11-08 Last updated: 2019-11-08Bibliographically approved

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Kapaklis, Vassilios

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