Phonon-enhanced Kondo lattice model in colossal magnetoresistive manganites

摘要

We investigate theoretically manganese oxides where the colossal magnetoresistance (CMR) is observed. Recent studies show that, if there are both an electron and a hole in the e(g)-band of Mn, the Jahn-Teller distortions split the band into a conduction band (e(g)(c)) and a localized band (e(g)(l)). We find a Kondo lattice model with hole conduction in manganese oxides when the electron in the localized e(g)-band (e(g)(l)) plays the role of the Kondo impurity. The Curie temperature (T-c) and the resistivity are calculated. We also calculate the antiferromagnetic temperature by a spin-Peierls transition.