New Correlated Model of Colossal Magnetoresistive Manganese Oxides

TL;DR

This paper introduces a new minimal theoretical model for doped manganese oxides exhibiting colossal magnetoresistance, highlighting complex spin dynamics and temperature-dependent electronic structure.

Contribution

The paper presents a novel minimal model incorporating broad conduction bands and localized states to explain CMR phenomena in manganese oxides.

Findings

Temperature-dependent hybridized band structure

Suppressed carrier weight at Fermi level

Strong spin wave damping observed

Abstract

A new minimal model is constructed for the doped manganese oxides which exhibit colossal magnetoresistance (CMR), involving broad spin-majority conduction band as well as nearly localised spin-minority electron states. A simple mean field analysis yields a temperature-dependent hybridised band structure with suppressed carrier weight at the Fermi level. Spin stiffness is complex, indicating unusually strong spin wave damping. Experimental and theoretical investigations are needed to further verify the relevance of the proposed model.