Dynamical mean-field theory for manganites

Yi-Feng Yang
In this thesis, we perform dynamical mean-field theory (DMFT) calculations for perovskite manganites such as La$_{1-x}$Sr(Ca)$_x$MnO$_3$. These materials have been intensively investigated due to an extraordinary property: colossal magnetoresistance (CMR). The complicated phase diagrams of perovskite manganites reflect the internal complexity resulting from the interplay between charge, spin, orbital and lattice degrees of freedom. In doped manganites, optical experiments show unusual dynamic properties such as a pseudo-gap behavior. Whereas the low temperature ferromagnetic metallic phase...
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