Dopant-dependent Magnetic and Transport Properties of Kagome-Lattice Co3Sn2S2-based Compounds

As a magnetic Weyl semimetal with broken time-reversal symmetry, Co3Sn2S2 is considered an exceptionally important platform for exploring spintronics and correlated quantum phenomena. In this work, Co2.8X0.2Sn2S2 (X = Fe, Ni, Mn) samples were synthesized to investigate the effects of dopants at specific concentrations on magnetic and transport properties. Magnetic measurements revealed that the selected dopants induce significant changes in the Curie temperature, magnetic moment, and coercive field stemming from differences in the strength and type of exchange interactions within the kagome lattice. Benefiting from the interplay between magnetism, electronic correlations, and nontrivial band topology, the amplitude, shape, and temperature characteristics of the anomalous Hall effect exhibit pronounced dopant dependence. Qualitative and quantitative analyses based on scaling laws clearly demonstrate that the anomalous Hall effect is determined by both intrinsic and extrinsic mechanisms. These findings deepen our understanding of the transport properties of novel magnetic topological phases.