Magnetization relaxation and search for the magnetic gap in bulk-insulating V-doped (Bi, Sb)2Te3

E. Golias, E. Weschke, T. Flanagan, E. Schierle, A. Richardella, E. D.L. Rienks, P. S. Mandal, A. Varykhalov, J. Sánchez-Barriga, F. Radu, N. Samarth, O. Rader

Research output: Contribution to journalArticlepeer-review

Abstract

V-doped (Bi,Sb)2Te3 has a ten times higher magnetic coercivity than its Cr-doped counterpart and, therefore, is believed to be advantageous for the quantum anomalous Hall effect (QAHE). The QAHE requires the opening of a magnetic bandgap 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 derive spin and orbital magnetic moments of 1.69 and -0.22 atom. 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 timescale of minutes, which we conclude contributes to the absence of a detectable magnetic gap at the Dirac point.

Original languageEnglish (US)
Article number132404
JournalApplied Physics Letters
Volume119
Issue number13
DOIs
StatePublished - Sep 27 2021

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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