Magnetotransport in manganites and the role of quantal phases I: Theory

TL;DR

This paper develops a microscopic theory of charge transport in manganites near the ferromagnet-paramagnet transition, emphasizing inelastic hopping and the influence of quantal phases on the anomalous Hall effect.

Contribution

It introduces a detailed microscopic model incorporating magnetic disorder and quantal phases to explain transport phenomena in manganites.

Findings

Charge transport is dominated by inelastic carrier hopping.

Quantal phases significantly influence the anomalous Hall effect.

The theory provides insights into the role of magnetic disorder near phase transition.

Abstract

A microscopic picture of charge transport in manganites is developed, with particular attention being paid to the neighborhood of the ferromagnet-to- paramagnet phase transition. The basic transport mechanism invoked is inelastically-assisted carrier hopping between states localized by magnetic disorder. In the context of the anomalous Hall effect, central roles are played by the Pancharatnam and spin-orbit quantal phases.