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

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.

arXiv comment6 pages, 4 figures + Supplementary Information

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• Maximizing intrinsic anomalous Hall effect by controlling the Fermi level in simple Weyl semimetal films
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• Microscopic origins and stability of the ferromagnetism in Co${}_3$Sn${}_2$S${}_2$
• Electronic structure evolution of the magnetic Weyl semimetal Co${}_3$Sn${}_2$S${}_2$ with hole and electron doping
• Self-consistent Analysis of Doping Effect for Magnetic Ordering in Stacked-Kagome Weyl System
• Tuning the anomalous Nernst and Hall effects with shifting the chemical potential in Fe-doped and Ni-doped Co${}_3$Sn${}_2$S${}_2$
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• Weyl points and anomalous transport effects tuned by the Fe doping in Mn${}_3$Ge Weyl semimetal
• Electron-doped magnetic Weyl semimetal LixCo3Sn2S2 by bulk-gating
• Signatures of a topological Weyl loop in Co${}_3$Sn${}_2$S${}_2$