Robustness of large intrinsic anomalous Hall conductivity in Se-doped magnetic Weyl semimetal Co3Sn2S2

Co ₃Sn ₂S ₂, as the first experimentally and theoretically confirmed magnetic Weyl semimetal, exhibits significant intrinsic anomalous Hall conductivity (AHC) and anomalous Hall angle (AHA) due to the non-trivial topological Weyl points and nodal rings near the Fermi level. Further researchs have shown that doping electrons and holes in the kagome layers will further enhance the intrinsic AHC of the system. However, the impact of substitution of elements in the same main group on the intrinsic AHC is still unclear. In this work, based on transport measurements and transport scaling, we systematically studied the effect of Se doping on the AHC of Co ₃Sn ₂S _{2- x}Se _x. The experimental results show that the AHC of the system exhibits robustness and does not undergo significant changes with the introduction of Se. It is mainly dominated by intrinsic mechanism and maintains the theoretical calculation value of the pristine Co ₃Sn ₂S ₂. This robust AHC mainly attributed to Se substitution for S does not affect the kagome layers composed of Co and Sn atoms, which dominate the topological electronic band and topological transport characteristics of pristine Co ₃Sn ₂S ₂. However, AHC exhibits robustness at a certain doping level, while the longitudinal conductivity decreases due to enhanced impurity scattering. This will will significantly enhance the AHA of the system. Our findings provide an important guidance for regulating transverse transport characteristics (AHC and AHA) in magnetic Weyl semimetal.