Columnar Fluctuations as a Source of Non-Fermi-Liquid Behavior in Weak Metallic Magnets

TL;DR

This paper proposes that columnar fluctuations combined with weak disorder cause non-Fermi-liquid behavior in MnSi, explaining its T^{3/2} resistivity, possibly due to skyrmion lines.

Contribution

It introduces a novel mechanism involving columnar fluctuations and disorder to explain non-Fermi-liquid behavior in weak metallic magnets.

Findings

Columnar fluctuations induce T^{3/2} resistivity.

Skyrmion lines may serve as the columnar fluctuations.

Explains non-Fermi-liquid behavior in MnSi.

Abstract

It is shown that columnar fluctuations, in conjunction with weak quenched disorder, lead to a T^{3/2} temperature dependence of the electrical resistivity. This is proposed as an explanation of the observed non-Fermi-liquid behavior in the helimagnet MnSi, with one possible realization of the columnar fluctuations provided by skyrmion lines that have independently been proposed to be present in this material.