Anomalous Hall effect in weak-itinerant ferrimagnet FeCr$_2$Te$_4$

TL;DR

This study investigates the electronic, thermal, and magnetic properties of FeCr$_2$Te$_4$, revealing a dominant extrinsic skew-scattering mechanism behind its anomalous Hall effect below 123 K, supported by experimental and Berry phase calculations.

Contribution

It provides the first comprehensive analysis of the AHE mechanism in FeCr$_2$Te$_4$, highlighting the extrinsic skew-scattering as the primary cause.

Findings

FeCr$_2$Te$_4$ exhibits bad-metallic behavior.

AHE appears below 123 K, linked to magnetic transition.

AHE is dominated by extrinsic skew-scattering, supported by Berry phase calculations.

Abstract

We carried out a comprehensive study of electronic transport, thermal and thermodynamic properties in FeCr$_2$Te$_4$ single crystals. It exhibits bad-metallic behavior and anomalous Hall effect (AHE) below a weak-itinerant paramagentic-to-ferrimagnetic transition $T_c$ $\sim$ 123 K. The linear scaling between the anomalous Hall resistivity $\rho_{xy}$ and the longitudinal resistivity $\rho_{xx}$ implies that the AHE in FeCr$_2$Te$_4$ is most likely dominated by extrinsic skew-scattering mechanism rather than intrinsic KL or extrinsic side-jump mechanism, which is supported by our Berry phase calculations.