Distortions of the oxygen sublattice couple to eg orbitals of Mn3+ and drive a cooperative Jahn-Teller (orbital ordering) transition in LaMnO3. A simple model for this transition is studied. Without further adjustment, the model predicts the shape and stability of small (anti-Jahn-Teller) polarons which form when holes are doped into the material. This leads to a new description of the lightly doped insulator, the anti-ferromagnetic to ferromagnetic transition, and the metal-insulator transition.
@article{arxiv.cond-mat/9811250,
title = {The Anti-Jahn-Teller Polaron in LaMnO$_3$},
author = {Philip B. Allen and Vasili Perebeinos},
journal= {arXiv preprint arXiv:cond-mat/9811250},
year = {2009}
}
Comments
8 pages, 5 figures; The revised version contains a discussion of the antiferromagnetic A to Ferromagnetic phase boundary, and an appendix giving details of the perturbative calculations