Sign-reversal and non-monotonicity of chirality-related anomalous Hall effect in highly conductive metals

TL;DR

This paper investigates the complex temperature-dependent behavior of the anomalous Hall effect in conductive metals, revealing how spin correlations influence its sign and magnitude.

Contribution

It identifies two key mechanisms—competition between short- and long-range spin correlations and non-monotonic spin correlation in high fields—that cause non-monotonicity and sign reversal.

Findings

Non-monotonic temperature dependence of Hall effect due to spin correlations

Sign reversal linked to high-field spin correlation effects

Hall effect reflects local spin correlation mechanisms

Abstract

The non-monotonic temperature dependence and sign reversal of chirality-related anomalous Hall effect in highly conductive metals are studied. Through the analysis of scattering rate, we find that the non-monotonicity and sign reversal have two major origins: (1) competition between the contribution from short-range and long-range spin correlations and (2) non-monotonic spin correlation in the high field. The former mechanism gives rise to non-monotonic temperature dependence in a wide range of electron density and, in some cases, a sign reversal of Hall resistivity as the temperature decreases. On the other hand, the latter mechanism is responsible for the sign reversal of Hall conductivity in the high field, which sign reversal generally occurs in magnets with antiferromagnetic interactions. The results demonstrate how the Hall effect reflects local spin correlation and provide insights into the mechanism of non-monotonicity and sign reversal of the anomalous Hall effect by spin chirality.