Chiral susceptibility in canonical spin glass and reentrant alloys from Hall effect measurements

TL;DR

This study measures the Hall effect in spin glass and reentrant alloys, revealing critical and sign-changing behaviors that support the existence of a chiral Hall effect contribution as theorized by Kawamura.

Contribution

It provides experimental evidence for a chiral Hall effect in spin glasses and reentrant alloys, supporting theoretical predictions.

Findings

Critical cusp in Hall coefficient for spin glasses

Sign change of Hall coefficient in reentrant alloys

Consistent interpretation with chiral Hall effect theory

Abstract

The extraordinary Hall effect coefficients $R_s(T)$ of the canonical spin glass alloys ${\bf Au}Fe 8 at%$ and ${\bf Au}Mn 8 at%$ and of an archetype reentrant system ${\bf Au}Fe 18 at%$ were measured as functions of temperature. The data show a critical cusp-like term superimposed on a smooth background for the spin glasses, and change of sign with temperature for the reentrant. The results can be interpreted consistently by invoking a chiral Hall effect contribution as proposed by Kawamura.