Percolation mechanism for Colossal Magnetoresistance

TL;DR

This paper proposes a percolation-based mechanism to explain colossal magnetoresistance as a critical phenomenon related to half-metallic behavior, capturing qualitative features across temperature ranges.

Contribution

It introduces a correlated percolation model that explains the underlying mechanism of colossal magnetoresistance, emphasizing its critical nature and temperature dependence.

Findings

The model captures all qualitative features of colossal magnetoresistance.

Colossal magnetoresistance is explained as a critical phenomenon.

The mechanism relies on the half-metallic behavior of materials.

Abstract

We argue that colossal magnetoresistance is a critical phenomenon and propose a mechanism to describe it. The mechanism relies on the halfmetallic behavior of the materials showing colossal magnetoresistance, and yields a correlated percolation model that, we argue, captures all qualitative features of colossal magnetoresistance, above as well as below the Curie temperature. The model only serves for revealing the underlying mechanism of colossal magnetoresistance, and does not aim to reproduce precise, numerical results.