Dynamical mean field theory for transition temperature and optics of CMR manganites

Details Dynamical mean field theory for transition temperature and optics of CMR manganites Dynamical mean field theory for transition temperature and optics of CMR manganites

2002-12-23

arxiv.org/abs/cond-mat/0212573v2

Phys. Rev. B 68, 115111, (2003)

Physics

Condensed Matter

Strongly Correlated Electrons

Published version; 10 pages, 9 figures

Scientific paper

10.1103/PhysRevB.68.115111

A tight binding parametrization of local spin density functional band theory is combined with a dynamical mean field treatment of correlations to obtain a theory of the magnetic transition temperature, optical conductivity and T=0 spinwave stiffness of a minimal model for the pseudocubic metallic $CMR$ manganites such a $La_{1-X}Sr_{x}MnO_{3}$. The results indicate that previous estimates of $T_{c}$ obtained by one of us (Phys. Rev. \textbf{B61} 10738-49 (2000)) are in error, that in fact the materials are characterized by Hunds coupling $J\approx 1.5eV$, and that magnetic-order driven changes in the kinetic energy may not be the cause of the observed 'colossal' magnetoresistive and multiphase behavior in the manganites, raising questions about our present understanding of these materials.

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