Large anomalous Hall effect in single crystals of the kagome Weyl ferromagnet Fe$_3$Sn

TL;DR

This study combines theoretical and experimental approaches to reveal a large anomalous Hall effect in Fe$_3$Sn, a ferromagnetic kagome metal with Weyl nodes, magnetic order at 725 K, and weak temperature dependence of Hall conductivity.

Contribution

It provides the first comprehensive analysis of the anomalous Hall effect in Fe$_3$Sn, linking experimental measurements with density-functional calculations and Weyl physics.

Findings

Anomalous Hall conductivity of ~500 (Ωcm)^{-1} at room temperature.

Weak temperature dependence of the anomalous Hall effect.

Identification of Weyl nodes near the Fermi energy.

Abstract

The material class of kagome metals has rapidly grown and has been established as a field to explore the interplay between electronic topology and magnetism. In this work, we report a combined theoretical and experimental study of the anomalous Hall effect of the ferromagnetic kagome metal Fe$_3$Sn. The compound orders magnetically at 725 K and presents an easy-plane anisotropy. Hall measurements in single crystals below room temperature yield an anomalous Hall conductivity $\sigma_{xy}\sim500\,(\Omega\textrm{cm})^{-1}$, which is found to depend weakly on temperature. This value is in good agreement with the band-intrinsic contribution obtained by density-functional calculations. Our calculations also yield the correct magnetic anisotropy energy and predict the existence of Weyl nodes near the Fermi energy.