Double degeneracy and Jahn-Teller effects in colossal-magnetoresistance perovskites
- Theoretical Division and Center for Nonlinear Studies, Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)
Jahn-Teller (JT) electron-phonon-coupling effects in the colossal-magnetoresistance perovskite compounds La{sub 1{minus}{ital x}}{ital A}{sub {ital x}}MnO{sub 3} are investigated. Electron-electron correlations between two degenerate Mn {ital e}{sub {ital g}} orbitals are studied in the Gutzwiller approximation. The static JT distortion and nonadiabatic 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. {copyright} {ital 1996 The American Physical Society.}
- OSTI ID:
- 280212
- Journal Information:
- Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 14 Vol. 53; ISSN 0163-1829; ISSN PRBMDO
- Country of Publication:
- United States
- Language:
- English
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