Paramagnons, weak disorder and positive giant magnetoresistance

TL;DR

This paper presents a theoretical explanation for positive giant magnetoresistance in weakly disordered metals, linking it to paramagnon interactions and spin scattering effects, with predictions matching recent experiments.

Contribution

The study introduces a new theoretical framework connecting paramagnon interactions to giant magnetoresistance in disordered metals, providing specific material-dependent predictions.

Findings

Good agreement with recent experimental data

Identification of paramagnon interaction as key factor

Prediction of material-specific magnetoresistance effects

Abstract

At low temperature and for finite spin scattering in a weakly disordered metal, for a certain value, predicted from our theory, of the material-dependent paramagnon interaction, the total conductivity becomes highly sensitive to the orbital effects of a finite magnetic field. As a consequence, positive giant magnetoresistance and giant corrections to the Hall coefficient arise. We obtain very good agreement between this theory and recent positive giant magnetoresistance experiments, while making specific material-dependent predictions.