Pressure-tunable large anomalous Hall effect of the ferromagnetic kagome-lattice Weyl semimetal Co3Sn2S2

TL;DR

This study explores how applying high pressure affects the anomalous Hall effect in the ferromagnetic kagome-lattice Weyl semimetal Co3Sn2S2, revealing suppression of ferromagnetism and complex changes in Hall conductivity.

Contribution

It provides the first detailed pressure-dependent analysis of the anomalous Hall effect in Co3Sn2S2, combining experimental and theoretical insights into the pressure-induced evolution of Weyl nodes.

Findings

Anomalous Hall resistivity decreases and nearly vanishes around 22 GPa.

The anomalous Hall conductivity exhibits non-monotonic behavior with pressure.

Intrinsic Berry curvature effects dominate the Hall response under high pressure.

Abstract

We investigate the pressure evolution of the anomalous Hall effect in magnetic topological semimetal Co3Sn2S2 in diamond anvil cells with pressures up to 44.9-50.9 GPa. No evident trace of structural phase transition is detected through synchrotron x-ray diffraction over the measured pressure range of 0.2-50.9 GPa. We find that the anomalous Hall resistivity and the ferromagnetism are monotonically suppressed as increasing pressure and almost vanish around 22 GPa. The anomalous Hall conductivity varies non-monotonically against pressure at low temperatures, involving competition between original and emergent Weyl nodes. Combined with first-principle calculations, we reveal that the intrinsic mechanism due to the Berry curvature dominates the anomalous Hall effect under high pressure.