Double Degeneracy and Jahn-Teller Effects in CMR Perovskites

Abstract

Jahn-Teller (JT) electron-phonon coupling effects in the colossal magnetoresistance perovskite compounds $L{a}_{1-x}{A}_{x}Mn{O}_3$ are investigated. Electron-electron correlations between two degenerate Mn $e_g$ 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.

11 RevTeX pages. 3 Figures available upon request. submitted to Phys. rev. B (Rapid Communications)

References in corpus (2)

• Double Exchange Alone Does Not Explain the Resistivity of $L{a}_{1-x}S{r}_{x}Mn{O}_3$
• Transport Properties of the Kondo Lattice Model in the Limit $S=\infty$ and $D=\infty$

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