Anomalous multi-order Raman scattering in LaMnO3: A signature of quantum lattice effects in a Jahn-Teller crystal

N. N. Kovaleva, O. E. Kusmartseva, K. I. Kugel, A. A. Maksimov, D. Nuzhnyy, A. M. Balbashov, E. I. Demikhov, A. Dejneka, V. A. Trepakov, F. V. Kusmartsev, A. M. Stoneham

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Abstract

The multi-order Raman scattering is studied up to fourth order for a detwinned LaMnO3 crystal. Based on a comprehensive data analysis of the polarization-dependent Raman spectra, we show that the anomalous features in the multi-order scattering could be the sidebands on the low-energy mode at about 25 cm-1. We suggest that this low-energy mode stems from the tunneling transition between the potential energy minima arising near the Jahn-Teller Mn3+ ion due to the lattice anharmonicity and that the multi-order scattering is activated by this low-energy electronic motion. The sidebands are dominated by the oxygen contribution to the phonon density-of-states, however, there is an admixture of an additional component, which may arise from coupling between the low-energy electronic motion and the vibrational modes.

Original languageBritish English
Article number155602
JournalJournal of Physics Condensed Matter
Volume25
Issue number15
DOIs
StatePublished - 17 Apr 2013

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