Spin scattering and noncollinear spin structure-induced intrinsic anomalous Hall effect in antiferromagnetic topological insulator
MnBi2Te4 has recently been established as an intrinsic antiferromagnetic (AFM) topological insulator—an ideal platform to create quantum anomalous Hall insulator and axion insulator states. We performed comprehensive studies on the structure, nontrivial surface state, and magnetotransport properties of this material. Our results reveal an intrinsic anomalous Hall effect arising from a noncollinear spin structure for the magnetic field parallel to the c axis. We observed negative magnetoresistance under arbitrary field orientation below and above the Néel temperature (TN), providing clear evidence for strong spin fluctuation-driven spin scattering in both the AFM and paramagnetic states. Furthermore, we found that the nontrivial surface state opens a large gap (~85meV) even far above TN. Our findings demonstrate that the bulk band structure of MnBi2Te4 is strongly coupled with the magnetic property and that a net Berry curvature in momentum space can be created in the canted AFM state. In addition, our results imply that the gap opening in the surface states is intrinsic, likely caused by the strong spin fluctuations in this material.
- Research Organization:
- Univ. of Arkansas, Fayetteville, AR (United States); Louisiana State Univ., Baton Rouge, LA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF)
- Grant/Contract Number:
- SC0019467; SC0012432; SC0019064; DMR-1157490; DMR1707502; DMR-1608752
- OSTI ID:
- 1558168
- Alternate ID(s):
- OSTI ID: 1593908; OSTI ID: 1677406
- Journal Information:
- Physical Review Research, Journal Name: Physical Review Research Vol. 1 Journal Issue: 1; ISSN 2643-1564
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
SUPERCONDUCTIVITY AND SUPERFLUIDITY
Anomalous Hall effect
Antiferromagnetism
Magnetotransport
Topological insulators
Angle-resolved photoemission spectroscopy
Magnetization measurements
Resistivity measurements
Scanning transmission electron microscopy
Anomalous Hall effect
Antiferromagnetism
Magnetotransport
Topological insulators
Angle-resolved photoemission spectroscopy
Magnetization measurements
Resistivity measurements
Scanning transmission electron microscopy