Dynamical Mean Field Theory of Double Perovskite Ferrimagnets

Abstract

The dynamical mean field method is used to analyze the magnetic transition temperature and optical conductivity of a model for the ferrimagnetic double perovskites such as $S{r}_{2}FeMo{O}_6$. The calculated transition temperatures and optical conductivities are found to depend sensitively on the band structure. For parameters consistent with local spin density approximation band calculations, the computed transition temperatures are lower than observed, and in particular decrease dramatically as band filling is increased, in contradiction to experiment. Band parameters which would increase the transition temperature are identified.

arXiv commentSupercedes cond-mat/000628 (PRB64 024424/1-4 (2001)

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• Correlation effects in pyrochlore iridate thin films grown along the $[111]$ direction
• Theory of metallic double perovskites with spin orbit coupling and strong correlations; application to ferrimagnetic Ba2FeReO6
• Orbital ordering and magnetic structures in $\LMFO$ and $\LWFO$ double perovskites
• Non-collinear Magnetic Order in the Double Perovskites: Double Exchange on a Geometrically Frustrated Lattice