Journal
JOURNAL OF PHYSICS-CONDENSED MATTER
Volume 25, Issue 15, Pages -Publisher
IOP Publishing Ltd
DOI: 10.1088/0953-8984/25/15/155602
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Funding
- ESF network-program AQDJJ
- Royal Society of London [JP 090710]
- Russian Foundation for Basic Research [10-02-92600-KO, 11-02-00708]
- Program of the Section of Physical Sciences of the Russian Academy of Sciences 'Strongly correlated electrons in condensed matter and structures'
- TACR (Technology Agency of the Czech Republic) [TA01010517]
- ASCR (Academy of Sciences of the Czech Republic) [AV0Z10100522]
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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.
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