Unusual Hall Effect Anomaly in MnSi Under Pressure

TL;DR

This paper reports a unique Hall effect anomaly in MnSi under pressure, linked to chiral spin textures, revealing new magnetic behaviors and potential precursor states in this material.

Contribution

It introduces a novel Hall response in MnSi under pressure, attributed to chiral spin textures, expanding understanding of magnetic phenomena in correlated electron systems.

Findings

Observation of a step-wise Hall conductivity profile

Identification of chiral spin textures as the origin

Potential link to partial-order magnetic states

Abstract

We report the observation of a highly unusual Hall current in the MnSi in an applied pressure P = 6-12 kbar. The Hall conductivity displays a distinctive step-wise field profile quite unlike any other Hall response observed in solids. We identify the origin of this Hall current with the effective real-space magnetic field due to chiral spin textures, which may be a precursor of the partial-order state at P>14.6 kbar. We discuss evidence favoring the chiral spin mechanism for the origin of the observed Hall anomaly.