2013/03/19 by N. N. Kovaleva, O. Kusmartseva, O. E. Kusmartseva +14
Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Anharmonicity #Condensed matter physics #Crystal (programming language) #Electronic and Structural Properties of Oxides #Ion #Jahn–Teller effect #Lattice (music) #Magnetic and transport properties of perovskites and related materials #Materials science #Molecular physics #Optics #Phonon #Phonon scattering #Physics #Quantum mechanics #Quantum tunnelling #Raman scattering #Raman spectroscopy #Scattering #cond-mat.str-el
paper · pdf · doi:10.1088/0953-8984/25/15/155602
published as J. Phys.: Condens. Matter 25 (2013) 155602 · 12 pages, 4 figures
openalex publication_date 2013/03/19 · arxiv created 2014/07/05 · arxiv updated 2014/07/08 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
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 Mn(3+) 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.