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arXiv · 2003.02412

Enhanced Anomalous Hall Effect in Magnetic Topological Semimetal Co$_3$Sn$_{2-x}$In$_x$S$_2$

Huibin Zhou·Guoqing Chang·Guangqiang Wang·Xin Gui·Xitong Xu·Jia-Xin Yin·Zurab Guguchia·Songtian S. Zhang·Tay-Rong Chang·Hsin Lin·Weiwei Xie·M. Zahid Hasan·Shuang Jia
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Abstract

We study the anomalous Hall Effect (AHE) of single-crystalline Co$_3$Sn$_{2-x}$In$_x$S$_2$ over a large range of indium concentration x from 0 to 1. Their magnetization reduces progressively with increasing x while their ground state evolves from a ferromagnetic Weyl semimetal into a nonmagnetic insulator. Remarkably, after systematically scaling the AHE, we find that their intrinsic anomalous Hall conductivity (AHC) features an unexpected maximum at around x = 0.15. The change of the intrinsic AHC corresponds with the doping evolution of Berry curvature and the maximum arises from the magnetic topological nodal-ring gap. Our experimental results show a larger AHC in a fundamental nodal-ring gap than that of Weyl nodes.

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Huibin Zhou, Guoqing Chang, Guangqiang Wang, Xin Gui, Xitong Xu, Jia-Xin Yin, Zurab Guguchia, Songtian S. Zhang, Tay-Rong Chang, Hsin Lin, Weiwei Xie, M. Zahid Hasan, Shuang Jia. 2020-03-05. Enhanced Anomalous Hall Effect in Magnetic Topological Semimetal Co$_3$Sn$_{2-x}$In$_x$S$_2$. https://doi.org/10.1103/physrevb.101.125121

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