SurfaceScience21 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 10: Poster Session I: Topological insulators
O 10.5: Poster
Montag, 1. März 2021, 10:30–12:30, P
Temperature Evolution of the Magnetic Gap in the Ferromagnetic Topological Insulator MnSb2Te4 probed by Scanning Tunneling Spectroscopy — •Philipp Küppers1, Stefan Wimmer2, Andreas Ney2, Jannik Zenner1, Marcus Liebmann1, Markus Morgenstern1, Günther Bauer2, and Gunther Springholz2 — 1II. Institute of Physics B and JARA-FIT, RWTH Aachen Unversity, 52074 Aachen, Germany — 2Institut für Halbleiter- und Festkörperphysik, Johannes Kepler Universität, Altenberger Straße 69, 4040 Linz, Austria
MnSb2Te4 has recently been established as a ferromagnetic topological insulator with out-of-plane anisotropy and large Curie temperature TC = 40-50 K [1]. Here, we show that it exhibits a band gap at the Fermi level that closes rather precisely at TC using scanning tunneling spectroscopy (STS) down to 4 K. At 4K, the gap has an average size of 17 meV exhibiting spatial fluctuations due to disorder with strength 11 meV and correlation length 2nm. We also applied in-plane magnetic fields in order to close the gap by changing of the magnetic orientation.
[1] Wimmer et al., arXiv:2011.07052 (2020)