تقرير
Magnetization relaxation and search for the magnetic gap in bulk-insulating V-doped (Bi, Sb)$_2$Te$_3$
| العنوان: | Magnetization relaxation and search for the magnetic gap in bulk-insulating V-doped (Bi, Sb)$_2$Te$_3$ |
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| المؤلفون: | Golias, E., Weschke, E., Flanagan, T., Schierle, E., Richardella, A., Rienks, E. D. L., Mandal, P. S., Varykhalov, A., Sánchez-Barriga, J., Radu, F., Samarth, N., Rader, O. |
| سنة النشر: | 2020 |
| المجموعة: | Condensed Matter |
| مصطلحات موضوعية: | Condensed Matter - Materials Science |
| الوصف: | 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. Comment: 12 pages, 3 figures |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1063/5.0070557 |
| URL الوصول: | http://arxiv.org/abs/2010.07083 |
| رقم الأكسشن: | edsarx.2010.07083 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1063/5.0070557 |
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