Transport properties in Simplified Double Exchange model

TL;DR

This paper investigates the transport properties of manganites using a simplified double-exchange model with Ising-type Hund coupling, employing dynamical mean-field theory to qualitatively reproduce experimental observations.

Contribution

It introduces a simplified double-exchange model with Ising Hund coupling and demonstrates its effectiveness in capturing manganite transport properties.

Findings

Qualitative agreement with experimental resistivity, thermal conductivity, and thermopower.

Simplified model captures key properties of manganites.

Supports the relevance of the double-exchange mechanism in manganite transport.

Abstract

Transport properties of the manganites by the double-exchange mechanism are considered. The system is modeled by a simplified double-exchange model, i.e. the Hund coupling of the itinerant electron spins and local spins is simplified to the Ising-type one. The transport properties such as the electronic resistivity, the thermal conductivity, and the thermal power are calculated by using Dynamical mean-field theory. The transport quantities obtained qualitatively reproduce the ones observed in the manganites. The results suggest that the Simplified double exchange model underlies the key properties of the manganites.