Pressure-Tuned Intrinsic Anomalous Hall Conductivity in Kagome Magnets RV₆Sn₆ (R = Gd, Tb)

Abstract

Exploration of exotic phenomena in magnetic topological systems is at the frontier of condensed matter physics, holding a significant promise for the applications in topological spintronics. However, complex magnetic structures carrying nontrivial topological properties hinder its progresses. Here, we investigate the pressure effect on the novel topological kagome magnets GdV6Sn6 and TbV6Sn6 to dig out the interplay between magnetic Gd/Tb layers and nonmagnetic V-based kagome sublattice. The pressure-tuned magnetic transition temperature T m in both compounds exhibit a turning point at the critical pressure P c, accompanying with a sign reversal in anomalous Hall effect (AHE). The separation of intrinsic and extrinsic contributions using the TYJ scaling model suggests that the intrinsic mechanism originating from the electronic Berry curvature holds the priority in the competition with extrinsic mechanism in AHE. Above findings can be attributed to the combined effect of pressure-tuned band topology and magnetic interaction in segregated layers. Our results provide a practical route to design and manipulate the intrinsic AHE in magnetic topological materials.

Pressure-Tunable Large Anomalous Hall Effect in Ferromagnetic Metal LiMn6Sn6

“…The Hall conductivity can be obtained from 𝜎𝑥𝑦 = 𝜌𝑦𝑥/(𝜌 2 𝑦𝑥 + 𝜌 2 𝑥𝑥 ). [19,24,44] Figures 4(a) and 4(b) display the corresponding AHC 𝜎 A 𝑥𝑦 at 200 K under different pressures in runs 1 and 2, respectively. In run 1, the saturation value of 𝜎 A 𝑥𝑦 is 326 Ω −1 •cm −1 at 0.69 GPa, comparable with 380 Ω −1 •cm −1 at ambient pressure.…”