Electronic Correlations in Manganites

TL;DR

This paper investigates how local electronic correlations affect colossal magnetoresistance manganites using a modified Kondo lattice model analyzed with dynamical mean-field theory, revealing significant impacts on spectral and transport properties.

Contribution

It introduces a two-band Kondo lattice model with local Coulomb repulsion and applies dynamical mean-field theory to study electronic correlations in manganites.

Findings

Electronic correlations significantly alter spectral functions.

Correlations impact optical conductivity.

They influence the paramagnetic-to-ferromagnetic phase transition.

Abstract

The influence of local electronic correlations on the properties of colossal magnetoresistance manganites is investigated. To this end, a ferromagnetic two-band Kondo lattice model is supplemented with the local Coulomb repulsion missing in this model, and is analyzed within dynamical mean-field theory. Results for the spectral function, optical conductivity, and the paramagnetic-to-ferromagnetic phase transition show that electronic correlations have drastic effects and may explain some experimental observations.