Abstract.
The lattice dynamics of regular LaMnO3 is calculated within a shell model with pairwise interionic interaction potentials and with a Jahn–Teller (JT) contribution included in the energy and the dynamical matrix of the crystal. A correlation is made between Raman spectral lines and lattice vibrations. The positions of some lines in the Raman spectrum are found to depend heavily on the linear JT coupling constant Ve. The effect of the JT coupling on the phonon dispersion of the LO mode in the Δ Brillouin-zone direction is investigated. A comparison with experiments is carried out.
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Received: 4 August 2001 / Accepted: 11 December 2001
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Nikiforov, A., Popov, S. The lattice dynamics of LaMnO3: the role of the orbital degrees of freedom . Appl Phys A 74 (Suppl 1), s1743–s1745 (2002). https://doi.org/10.1007/s003390201767
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DOI: https://doi.org/10.1007/s003390201767