The La1−xSrxMnO3 system with 0.2≲x≲0.4 has traditionally been modelled with a ``double exchange'' Hamiltonian, in which it is assumed that the only relevant physics is the tendency of carrier hopping to line up neighboring spins. We present a solution of the double exchange model, show it is incompatible with many aspects of the resistivity data, and propose that a strong electron-phonon interaction arising from a Jahn-Teller splitting of the outer Mn d-level plays a crucial role.
@article{arxiv.cond-mat/9501034,
title = {Double Exchange Alone Does Not Explain the Resistivity of $La_{1-x} Sr_x MnO_3$},
author = {A. J. Millis and P. B. Littlewood and B. I. Shraiman},
journal= {arXiv preprint arXiv:cond-mat/9501034},
year = {2009}
}