Anomalous Hall effect of ferromagnetic Fe3Sn2 single crystal with geometrically frustrated kagome lattice

TL;DR

This study investigates the anomalous Hall effect in ferromagnetic Fe3Sn2 single crystals with a kagome lattice, revealing intrinsic mechanisms and a temperature-dependent transition linked to spin reorientation.

Contribution

It provides the first detailed analysis of the intrinsic anomalous Hall effect in Fe3Sn2 with a kagome lattice, highlighting the role of spin reorientation transition.

Findings

Quadratic scaling between anomalous Hall resistivity and longitudinal resistivity.

Intrinsic Karplus-Luttinger mechanism dominates the AHE in Fe3Sn2.

Sudden jump in anomalous Hall conductivity at about 100 K associated with spin reorientation.

Abstract

The anomalous Hall effect is investigated for ferromagnetic Fe3Sn2 single crystal with geometrically frustrated kagome bilayer of Fe. The scaling behavior between anomalous Hall resistivity rho_{xy}^{A} and longitudinal resistivity rho_{xx} is quadratic and further analysis implies that the AHE in Fe3Sn2 single crystal should be dominated by the intrinsic Karplus-Luttinger mechanism rather than extrinsic skew-scattering or side-jump mechanisms. Moreover, there is a sudden jump of anomalous Hall conductivity sigma_{xy}^{A} appearing at about 100 K where the spin-reorientation transition from the c axis to the ab plane is completed. This change of sigma_{xy}^{A} might be related to the evolution of Fermi surface induced by the spin-reorientation transition.