Transport Properties for and Intermediate Valence Model of Tl$_{2}$Mn$_{2}$O$_{7}$

TL;DR

This paper models the transport properties of Tl$_{2}$Mn$_{2}$O$_{7}$ using an intermediate valence approach with Hubbard operators, achieving qualitative agreement with experimental thermopower and conductivity data.

Contribution

It applies an intermediate valence model with Hubbard operators and approximate Green's functions to describe Tl$_{2}$Mn$_{2}$O$_{7}$'s electronic and transport properties, extending previous theoretical work.

Findings

Qualitative agreement with experimental thermopower data

Reproduction of static and dynamic conductivity trends

Model parameters effectively describe transport properties

Abstract

The appearance of colossal magneto resistance (CM) in Tl$_{2}$Mn$_{2}$O$_{7}$ has stimulated many recent studies of the pyrochlore family of compounds A$_{2}$B$_{2}$O$_{7}$. The double exchange (DE) model of Zener does not describe the CM in Tl$_{2}$Mn$_{2}$O$_{7}$, because its metallic conductivity cannot be explained by doping. Here we employ Hubbard operators to reformulate the intermediate valence model used by Ventura and Alascio to describe the electronic structure and transport properties of this compound $(Phys.Rev. B56, 14533 (1997)). Following Foglio and Figueira (Phys.Rev. B62, 7882 (2000)) we use approximate one-electron Green's Functions (GF) to calculate the thermopower and the static and dynamic conductivity of Tl$_{2}$Mn$_{2}$O$_{7}$ for several magnetic fields. A qualitative agreement was obtained with the experimental measurements of those properties. Although the agreement is far from perfect, these quantities are fairly well described by the same set of system parameters.