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

doi:10.1063/5.0070557

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

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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 language	English (US)
Article number	132404
Journal	Applied Physics Letters
Volume	119
Issue number	13
DOIs	https://doi.org/10.1063/5.0070557
State	Published - Sep 27 2021

All Science Journal Classification (ASJC) codes

Physics and Astronomy (miscellaneous)

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10.1063/5.0070557

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

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.",

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doi = "10.1063/5.0070557",

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T1 - Magnetization relaxation and search for the magnetic gap in bulk-insulating V-doped (Bi, Sb)2Te3

AU - Golias, E.

AU - Weschke, E.

AU - Flanagan, T.

AU - Schierle, E.

AU - Richardella, A.

AU - Rienks, E. D.L.

AU - Mandal, P. S.

AU - Varykhalov, A.

AU - Sánchez-Barriga, J.

AU - Radu, F.

AU - Samarth, N.

AU - Rader, O.

PY - 2021/9/27

Y1 - 2021/9/27

N2 - 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.

AB - 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.

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JF - Applied Physics Letters

IS - 13

M1 - 132404

ER -

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

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