Localization of strongly correlated electrons as Jahn-Teller polarons in manganites
arXiv:cond-mat/0603553 · doi:10.1103/PhysRevB.76.212401
Abstract
A realistic modeling of manganites should include the Coulomb repulsion between $e_g$ electrons, the Hund's rule coupling to $t_{2g}$ spins, and Jahn-Teller phonons. Solving such a model by dynamical mean field theory, we report large magnetoresistances and spectra in good agreement with experiments. The physics of the unusual, insulating-like paramagnetic phase is determined by correlated electrons which are-due to strong correlations-easily trapped as Jahn-Teller polarons.
4 pages, 3 figures