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

M. E. Foglio; G. E. Barberis

doi:10.1016/j.physb.2004.09.014

paper

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

arXiv:cond-mat/0410163 · doi:10.1016/j.physb.2004.09.014

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 $(P h y s . R e v . B 56, 14533 (1997)) . F o l l o w in g F o g l i o an d F i g u e i r a (P h y s . R e v . B 62, 7882 (2000)) w e u se a pp r o x ima t eo n e - e l ec t r o n G r ee n^{'} s F u n c t i o n s (GF) t oc a l c u l a t e t h e t h er m o p o w er an d t h es t a t i c an dd y nami cco n d u c t i v i t y o f T l$ _{2} $M n$ _{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.

10 pages, 10 figures, 1 table

Transport Properties for and Intermediate Valence Model of Tl2​Mn2​O7​

Abstract

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