Berlin 2018 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 68: Topological Insulators and Weyl Semimetals (joint session MA/TT)
TT 68.5: Vortrag
Mittwoch, 14. März 2018, 16:00–16:15, EB 407
Ferro- and ferrimagnetic coupling in Cr/Bi2Se3(0001) — •Andrey Polyakov1, Katayoon Mohseni1, E. Daryl Crozier2, Manuel Valvidares3, Victor N. Antonov1, Lev V. Bekenov1, Arthur Ernst4, Holger L. Meyerheim1, and Evgueni V. Chulkov5 — 1MPI für Mikrostrukturphysik, Weinberg 2, D-06120 Halle, Germany — 2Department of Physics, SFU Burnaby, BC Canada, V5A 1S6 — 3Alba Synchrotron, 08290 Cerdanyola del Valles Barcelona, Spain — 4Institut für Theoretische Physik, Johannes Kepler Universität, A 4040 Linz, Austria — 5DIPC, 20018 San Sebastian/Donostia, Basque Country, Spain
Using surface x-ray diffraction, x-ray absorption fine structure and x-ray magnetic circular dichroism experiments in combination with ab-initio calculations we have studied the atomic and magnetic structure of ultra-thin Cr films deposited in the 0.2 to 2.5 monolayer thickness regime on Bi2Se3(0001). We find a complex pattern of different adsorption sites (substitutional, van-der Waals gap, and surface double layer formation) involving ferro- and ferri-magnetic exchange. Magnetic moments are close to 4µB related to Cr2+. Our study sheds new light on the understanding of magnetic doped topological insulators. Acknowledgements: Supported by SPP 1666. Work at the APS is supported by the U.S. DOE under Contract No. DE-AC02-06CH11357.