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Large anomalous Hall effect induced by weak ferromagnetism in the noncentrosymmetric antiferromagnet CoNb3S6

Journal Article · · Physical Review. B
 [1];  [2];  [1];  [3];  [1];  [1];  [4];  [4];  [5];  [5];  [6];  [6];  [6];  [7];  [2];  [1]
  1. Univ. of Tokyo (Japan)
  2. Tokyo Institute of Technology, Yokohama, Kanagawa (Japan)
  3. Univ. of Tokyo (Japan); Institute for Basic Science, Seoul (Korea, Republic of); Seoul National Univ. (Korea, Republic of)
  4. Institute for Molecular Science (IMS), Okazaki, Aichi (Japan)
  5. SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Synchrotron Radiation Lightsource (SSRL)
  6. Elettra-Sincrotrone Trieste (Italy)
  7. Japan Synchrotron Radiation Research Institute, Sayo, Hyogo (Japan)
+ Show Author Affiliations
We study the mechanism of the exceptionally large anomalous Hall effect (AHE) in the noncentrosymmetric antiferromagnet CoNb3S6 by angle-resolved photoemission spectroscopy (ARPES) and magnetotransport measurements. From ARPES measurements of CoNb3S6 and its family compounds (FeNb3S6 and CoNb3S6), we find a band dispersion unique to the Co intercalation existing near the Fermi level. We further demonstrate that a slight deficiency of sulfur in CoNb3S6 eliminates the ferromagnetism and the AHE simultaneously while hardly changing the band structure, indicating that the weak ferromagnetism is responsible for the emergence of the large AHE. Based on our results, we propose Weyl points near the Fermi level to cause the large AHE.
Research Organization:
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Organization:
Institute for Basic Science in Korea; JSPS; Murata Science Foundation; USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC02-76SF00515
OSTI ID:
1866829
Journal Information:
Physical Review. B, Journal Name: Physical Review. B Journal Issue: 12 Vol. 105; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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