Singh, Rahul ; Kumar, Shiv ; Jain, A. ; Singh, Mahima ; Ghosh, Labanya ; Singh, A. ; Banik, Soma ; Lakhani, A. ; Patil, S. ; Schwier, E.F. ; Shimada, K. ; Yusuf, S.M. ; Chatterjee, Sandip (2021) Competition between axial anomaly and ferromagnetic ordering in Bi2-xFexSe3–xSx topological insulator: A study of magnetic and magnetotransport properties Journal of Materiomics . ISSN 2352-8478
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Official URL: http://doi.org/10.1016/j.jmat.2021.11.005
Related URL: http://dx.doi.org/10.1016/j.jmat.2021.11.005
Abstract
The topological insulators Bi2-xFexSe3–xSx have been investigated by the dc-magnetization, magneto-transport and angle resolved photoemission spectroscopy (ARPES) techniques. With doping of Fe and S, a negative giant magneto-resistance (MR) is observed for parallel electric and magnetic fields (H||E). The MR behavior at lower magnetic field can be explained with the semi-classical theory whereas the MR behavior at higher field has been attributed to the axial anomaly. Interestingly, the system reached to the quantum limit at low magnetic field (∼ 4.5T). The magnetic ordering can be explained with the presence of both the RKKY (surface) and van-Vleck (bulk) interaction. The ARPES study reveals that a surface gap is suppressed when the magnetic ordering changes from ferromagnetic to anti-ferromagnetic ordering. The ARPES study and the appearance of quantum oscillations (SdH) in the resistivity pattern reveal that the topological surface property is preserved with the co-doping of Fe and S.
| Item Type: | Article |
|---|---|
| Source: | Copyright of this article belongs to Elsevier Science. |
| ID Code: | 125513 |
| Deposited On: | 08 Feb 2022 07:13 |
| Last Modified: | 08 Feb 2022 07:13 |
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