Magnetization relaxation and search for the magnetic gap in bulk insulating V doped Bi,Sb 2Te3
| Autor: | E. D. L. Rienks, P. S. Mandal, Oliver Rader, E. Golias, Nitin Samarth, Florin Radu, Andrei Varykhalov, Jaime Sánchez-Barriga, Eugen Weschke, Enrico Schierle, A. Richardella, Thomas Flanagan |
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| Rok vydání: | 2021 |
| Předmět: |
Condensed Matter - Materials Science
Materials science Physics and Astronomy (miscellaneous) Magnetic moment Condensed matter physics Magnetic circular dichroism Magnetism Relaxation (NMR) Materials Science (cond-mat.mtrl-sci) FOS: Physical sciences Quantum anomalous Hall effect Coercivity Magnetic field doping magnetic materials Hall effect epitaxy graphene Magnetization Condensed Matter::Materials Science |
| Popis: | V-doped (Bi,Sb)$_2$Te$_3$ has a ten times higher magnetic coercivity than its Cr-doped counterpart and therefore is believed to be a superior system for the quantum anomalous Hall effect (QAHE). The QAHE requires the opening of a magnetic band gap at the Dirac point. We do not find this gap by angle-resolved photoelectron spectroscopy down to 1 K. By x-ray magnetic circular dichroism (XMCD) we directly probe the magnetism at the V site and in zerofield. Hysteresis curves of the XMCD signal show a strong dependence of the coercivity on the ramping velocity of the magnetic field. The XMCD signal decays on a time scale of minutes which we conclude contributes to the absence of a detectable magnetic gap at the Dirac point. 12 pages, 3 figures |
| Databáze: | OpenAIRE |
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