Pressure-Tunable Large Anomalous Hall Effect in Ferromagnetic Metal LiMn₆Sn₆

Abstract

Recently, the giant intrinsic anomalous Hall effect (AHE) has been observed in the materials with kagome lattice. In this study, we systematically investigate the influence of high pressure on the AHE in the ferromagnet LiMn6Sn6 with clean Mn kagome lattice. Our in-situ high-pressure Raman spectroscopy indicates that the crystal structure of LiMn6Sn6 maintains a hexagonal phase under high pressures up to 8.51 GPa. The anomalous Hall conductivity (AHC) σxy A remains around 150 Ω-1 cm-1, dominated by the intrinsic mechanism. Combined with theoretical calculations, our results indicate that the stable AHE under pressure in LiMn6Sn6 originates from the robust electronic and magnetic structure.

Layer-Valley Hall Effect under Inversion and Time-Reversal Symmetries

“…[1,2] The study of Hall effects has strongly advanced our understanding of fundamental physical properties (e.g., fractional statistics, topological and geometrical properties of Bloch wavefunctions) and substantially transformed the landscape of technological innovations (such as magnetic field measurements, metrological resistance standard, and topological quantum computing). [2][3][4][5][6][7][8][9] To date, the Hall effects have mainly focused on a single internal degree of freedom (DoF) of electrons/holes, such as charge DoF (ordinary Hall effect and nonlinear Hall effect), spin DoF (spin Hall effect), valley DoF (valley Hall effect), and layer DoF (layer Hall effect). [6,[10][11][12][13][14][15][16][17] Typically, most Hall effects based on a single DoF require the breaking of spatial-inversion and/or time-reversal symmetries.…”