Regensburg 2022 – wissenschaftliches Programm

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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur

KFM 28: Topological Insulators (joint session MA/KFM)

KFM 28.3: Vortrag

Donnerstag, 8. September 2022, 15:45–16:00, H37

Local magnetic and electronic properties of the intrinsic magnetic topological insulator MnBi₆Te₁₀ — •Abdul-Vakhab Tcakaev¹, Volodymyr Zabolotnyy¹, Bastian Rubrecht², Laura Corredor², Jorge Facio², Laura Folkers³, Anja Wolter², Anna Isaeva², and Vladimir Hinkov¹ — ¹Experimentelle Physik IV and R ontgen Research Center for Complex Materials (RCCM), Fakult at f ur Physik und Astronomie, Universit at W urzburg, Am Hubland, D-97074 W urzburg, Germany — ²Leibniz IFW Dresden, Helmholtzstraße 20, D-01069 Dresden, Germany — ³Faculty of Physics, Technische Universit at Dresden, D-01062 Dresden, Germany

The recent observation of novel phenomena in the intrinsic magnetic topological insulator MnBi₂Te₄, such as the quantum anomalous Hall effect and the topological magnetoelectric effect has prompted research of the higher-n members of the (MnBi₂Te₄)(Bi₂Te₃)_n family. Here we combine x-ray absorption spectroscopy, and x-ray circular and linear dichroism at the Mn L_2,3 edges, with density-functional (DFT) and multiplet ligand-field (MLFT) theory to investigate the ground state of Mn in MnBi₆Te₁₀ single crystals. Our magnetometry data reveal FM state with finite remanence consistent with the spectroscopy data. Our spectroscopy results together with DFT and ab initio MLFT calculations allow us to determine in full detail the local magnetic and electronic properties of the Mn ions in the bulk and near the surface, and deliver important microscopic physical parameters, including Mn 3d-shell occupation, the spin and orbital magnetic moments.