We propose two statistical models for description the metal-insulator phase transition coupled with paramagnetic-ferromagnetic phase transition in manganites of the type La_{1-x}Sr_xMnO_3. The first one based on the competition of small polarons and delocalized carriers. In the second one the conductivity appears as a result of overlapping of large polarons. We compare our models with the experimental data.
@article{arxiv.cond-mat/9808248,
title = {Statistical Models of the Polaronic Phase Transition in Manganites},
author = {Igor F. Lyuksyutov and Valery Pokrovsky},
journal= {arXiv preprint arXiv:cond-mat/9808248},
year = {2007}
}