Pressure-Enhanced Intrinsic Anomalous Hall Conductivity in the Kagome Ferrimagnet TbMn 6 Sn 6

Abstract The kagome ferrimagnet TbMn 6 Sn 6 , featuring a pristine Mn kagome lattice, has emerged as a candidate Chern magnet with a large intrinsic anomalous Hall effect (AHE). While chemical substitution can modulate its properties, hydrostatic pressure provides a disorder-free route to manipulate electronic and magnetic interactions. Herein, we investigate the effects of hydrostatic pressure on electrical and magneto-transport in TbMn 6 Sn 6 up to 18.3 GPa. Pressure significantly enhances hysteresis in the magnetoresistance and Hall responses, causing a concurrent monotonic coercive field increase, suggesting the enhancement of interlayer magnetic couplings in a robust c -axis ferrimagnetic order. The intrinsic anomalous Hall conductivity increases considerably from 129.5 S⋅cm −1 at ambient pressure conditions to 448.7 S⋅cm −1 at 14.0 GPa—an enhancement of 247% that is unprecedented among pressure-tuned kagome magnets. Based on density functional theory calculations, we reveal that pressure induces multiple gap openings near the Fermi level, giving rise to pronounced Berry curvature hotspots that may contribute to the AHE. Our results show that pressure can be used to enhance the intrinsic topological responses of this kagome magnet.