Abstract
We investigate the combined influence of superexchange and electron-phonon interactions on the excitation spectra and on hole propagation in a ferromagnetic plane of LaMnO 3 . The Jahn-Teller effect modifies the energies of both orbital and phonon excitations and can lead to modes with mixed character, and for strong Jahn-Teller interaction even to a structural instability due to profound softening of one of the phonon modes. Solving the problem of hole propagation in the self-consistent Born approximation, we found that the quasiparticle states at the bottom of the spectrum are accompanied by broad structures, representing vibrational side bands which result from the hole-lattice coupling.
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