Large intrinsic anomalous Hall effect in half-metallic ferromagnet Co3Sn2S2 with magnetic Weyl fermions

Qi Wang, Yuanfeng Xu, Rui Lou, Zhonghao Liu, Man Li, Yaobo Huang, Dawei Shen, Hongming Weng (), Shancai Wang () and Hechang Lei ()
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Qi Wang: Renmin University of China
Yuanfeng Xu: Chinese Academy of Sciences
Rui Lou: Renmin University of China
Zhonghao Liu: Chinese Academy of Sciences
Man Li: Renmin University of China
Yaobo Huang: Chinese Academy of Sciences
Dawei Shen: Chinese Academy of Sciences
Hongming Weng: Chinese Academy of Sciences
Shancai Wang: Renmin University of China
Hechang Lei: Renmin University of China

Nature Communications, 2018, vol. 9, issue 1, 1-8

Abstract: Abstract The origin of anomalous Hall effect (AHE) in magnetic materials is one of the most intriguing aspects in condensed matter physics and has been a controversial topic for a long time. Recent studies indicate that the intrinsic AHE is closely related to the Berry curvature of occupied electronic states. In a magnetic Weyl semimetal with broken time-reversal symmetry, there are significant contributions to Berry curvature around Weyl nodes, possibly leading to a large intrinsic AHE. Here, we report the quite large AHE in the half-metallic ferromagnet Co3Sn2S2 single crystal. By systematically mapping out the electronic structure of Co3Sn2S2 both theoretically and experimentally, we demonstrate that the intrinsic AHE from the Weyl fermions near the Fermi energy is dominating. The intrinsic anomalous Hall conductivity depends linearly on the magnetization and can be reproduced by theoretical simulation, in which the Weyl nodes monotonically move with the constrained magnetic moment on Co atom.

Date: 2018
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DOI: 10.1038/s41467-018-06088-2

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