Giant Anomalous Hall Effect in the Kagome Ferrimagnet Tb1–xYxMn6Sn6 Single Crystals

The kagome ferrimagnet TbMn₆Sn₆ has been shown to host Chern-gapped Dirac fermions in the band structure, theoretically promising a large anomalous Hall effect (AHE). However, the experimentally observed AHE in TbMn₆Sn₆ is relatively modest compared with other topological magnetic materials. Here, we report a giant AHE in the single crystals of Tb_1–xY_xMn₆Sn₆ (x = 0.1–0.8), which retain the same ferrimagnetic ground state as pristine TbMn₆Sn₆. A significant enhancement of both intrinsic and extrinsic contributions to the anomalous Hall conductivity (AHC) is observed, resulting in a maximum AHC of 2202 Ω^–1 cm^–1 for x = 0.7. This is a record within the RMn₆Sn₆ (R = Gd–Er) family and surpasses most of the magnetic AHE materials. We attribute the enhanced intrinsic AHC to disorder-induced band structure modulation and the boosted extrinsic contribution to the high density of scattering centers and preserved high conductivity owing to the similar ionic radii of Y and Tb.