Regensburg 2022 – wissenschaftliches Programm

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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur

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

KFM 28.5: Vortrag

Donnerstag, 8. September 2022, 16:15–16:30, H37

Magnetotransport Properties of MnSb2Te4 — •Michael Wissmann1,2,3, Joseph Dufouleur2, Anna Isaeva4, Bernd Büchner2,3, and Romain Giraud1,21Université Grenoble-Alpes, CNRS, CEA, SPINTEC, F-38000 Grenoble, France — 2Leibniz Institute for Solid State and Materials Research IFW Dresden, 01069 Dresden, Germany — 3Institute of Solid State Physics, TU Dresden, 01069 Dresden, Germany — 4Department of Physics and Astronomy, University of Amsterdam,1098 XH Amsterdam, Netherlands

The new family of intrinsically magnetic van-der-Waals layered topological insulators Mn(Bi,Sb)Te, with strong spin-orbit coupling, is of great interest to investigate the interplay between topology and magnetic order in electronic band structures. When introducing magnetism into a 3D topological insulator, this interplay can generate topological quantum states like the quantum anomalous Hall effect (QAH) or the axion insulator, which can be modified by tuning the magnetization.

Our recent studies consider the MnSb2Te4 compound, a ferromagnet with a perpendicular-to-plane anisotropy and a critical Curie-Weiss temperature as high as 50K. MnSb2Te4 has been controversially discussed to be a magnetic Weyl semimetal or a candidate to realize the axion insulator. We investigated the thickness-dependent properties of exfoliated nanoflakes using magneto-transport, revealing the change in important parameters such as the resistivity, the Curie temperature and the magnetic coercive field. The influence of both the intrinsic electrical doping and disorder in magnetic topological insulators is considered as well.

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