Double Degeneracy and Jahn-Teller Effects in CMR Perovskites
Condensed Matter
2009-10-28 v1
Abstract
Jahn-Teller (JT) electron-phonon coupling effects in the colossal magnetoresistance perovskite compounds are investigated. Electron-electron correlations between two degenerate Mn orbitals are studied in the Gutzwiller approximation. The static JT distortion and antiadiabatic polaron effects are studied in a modified Lang-Firsov approximation. We find that (i) the electron or hole character of the charge carrier depends on the static JT distortion, and (ii) due to the two-component nature of the JT coupling, fluctuations in the JT distortion direction contribute to the charge transport in similar fashion as the local spins.
Keywords
Cite
@article{arxiv.cond-mat/9507097,
title = {Double Degeneracy and Jahn-Teller Effects in CMR Perovskites},
author = {Jun Zang and A. R. Bishop and H. Roder},
journal= {arXiv preprint arXiv:cond-mat/9507097},
year = {2009}
}
Comments
11 RevTeX pages. 3 Figures available upon request. submitted to Phys. rev. B (Rapid Communications)