角分辨光电子能谱
反铁磁性
铁磁性
凝聚态物理
物理
霍尔效应
光电发射光谱学
费米能级
电子能带结构
作者
Hajime Tanaka,Shota Okazaki,Kenta Kuroda,Ryo Noguchi,Yosuke Arai,Susumu Minami,S. Ideta,Kiyohisa Tanaka,Donghui Lu,Makoto Hashimoto,Viktor Kandyba,Mattia Cattelan,Alexei Barinov,Takayuki Muro,Takao Sasagawa,Takeshi Kondo
出处
期刊:Physical review
日期:2022-03-04
卷期号:105 (12)
标识
DOI:10.1103/physrevb.105.l121102
摘要
We study the mechanism of the exceptionally large anomalous Hall effect (AHE) in the noncentrosymmetric antiferromagnet $\mathrm{Co}\mathrm{Nb}_3\mathrm{S}_6$ by angle-resolved photoemission spectroscopy (ARPES) and magnetotransport measurements. From ARPES measurements of $\mathrm{Co}\mathrm{Nb}_3\mathrm{S}_6$ and its family compounds ($\mathrm{Fe}\mathrm{Nb}_3\mathrm{S}_6$ and $\mathrm{Ni}\mathrm{Nb}_3\mathrm{S}_6$), 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 $\mathrm{Co}\mathrm{Nb}_3\mathrm{S}_6$ 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.
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