Large anomalous Hall effect induced by weak ferromagnetism in the noncentrosymmetric antiferromagnet <math xmlns="http://www.w3.org/1998/Math/MathML"><msub><mi mathvariant="normal">CoNb</mi><mn>3</mn></msub><msub><mi mathvariant="normal">S</mi><mn>6</mn></msub></math>

Hiroaki Tanaka; Shota Okazaki; Kenta Kuroda; Ryo Noguchi; Yosuke Arai; Susumu Minami; Shinichiro Ideta; Kiyohisa Tanaka; Donghui Lu; Makoto Hashimoto; Viktor Kandyba; Mattia Cattelan; Alexei Barinov; Takayuki Muro; Takao Sasagawa; Takeshi Kondo

doi:10.1103/PhysRevB.105.L121102

Letter

Large anomalous Hall effect induced by weak ferromagnetism in the noncentrosymmetric antiferromagnet ${CoNb}_{3} S_{6}$

Hiroaki Tanaka ¹, Shota Okazaki², Kenta Kuroda ^1,*, Ryo Noguchi ^1,3,4, Yosuke Arai¹, Susumu Minami⁵, Shinichiro Ideta ^6,†, Kiyohisa Tanaka⁶, Donghui Lu⁷ et al.

Makoto Hashimoto⁷, Viktor Kandyba⁸, Mattia Cattelan⁸, Alexei Barinov⁸, Takayuki Muro⁹, Takao Sasagawa^2,‡, and Takeshi Kondo^1,10,§

¹Institute for Solid State Physics, The University of Tokyo, Kashiwa, Chiba 277-8581, Japan
²Materials and Structures Laboratory, Tokyo Institute of Technology, Yokohama, Kanagawa 226-8503, Japan
³Center for Correlated Electron Systems, Institute for Basic Science, Seoul 08826, Republic of Korea
⁴Department of Physics and Astronomy, Seoul National University, Seoul 08826, Republic of Korea
⁵Department of Physics, The University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan
⁶UVSOR Facility, Institute for Molecular Science, Okazaki, Aichi 444-8585, Japan
⁷Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
⁸Elettra Sincrotrone Trieste, 34149 Basovizza, Trieste, Italy
⁹Japan Synchrotron Radiation Research Institute (JASRI), Sayo, Hyogo 679-5198, Japan
¹⁰Trans-scale Quantum Science Institute, The University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan

^*Present address: Graduate School of Advanced Science and Engineering, Hiroshima University, Higashi-hiroshima, Hiroshima 739-8526, Japan; kuroken224@hiroshima-u.ac.jp
^†Present address: Hiroshima Synchrotron Radiation Center, Hiroshima University, Higashi-hiroshima, Hiroshima 739-0046, Japan.
^‡sasagawa@msl.titech.ac.jp
^§kondo1215@issp.u-tokyo.ac.jp

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Phys. Rev. B 105, L121102 – Published 4 March, 2022

DOI: https://doi.org/10.1103/PhysRevB.105.L121102

Abstract

We study the mechanism of the exceptionally large anomalous Hall effect (AHE) in the noncentrosymmetric antiferromagnet $Co {Nb}_{3} S_{6}$ by angle-resolved photoemission spectroscopy (ARPES) and magnetotransport measurements. From ARPES measurements of $Co {Nb}_{3} S_{6}$ and its family compounds ( $Fe {Nb}_{3} S_{6}$ and $Ni {Nb}_{3} S_{6}$ ), 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 $Co {Nb}_{3} S_{6}$ 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.

Physical Review B

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Large anomalous Hall effect induced by weak ferromagnetism in the noncentrosymmetric antiferromagnet ${CoNb}_{3} S_{6}$

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

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Large anomalous Hall effect induced by weak ferromagnetism in the noncentrosymmetric antiferromagnet ${CoNb}_{3} S_{6}$