We study the anomalous Hall Effect (AHE) of single-crystalline Co3Sn2−xInxS2 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.
@article{arxiv.2003.02412,
title = {Enhanced Anomalous Hall Effect in Magnetic Topological Semimetal Co$_3$Sn$_{2-x}$In$_x$S$_2$},
author = {Huibin Zhou and Guoqing Chang and Guangqiang Wang and Xin Gui and Xitong Xu and Jia-Xin Yin and Zurab Guguchia and Songtian S. Zhang and Tay-Rong Chang and Hsin Lin and Weiwei Xie and M. Zahid Hasan and Shuang Jia},
journal= {arXiv preprint arXiv:2003.02412},
year = {2020}
}