Abstract
A theoretical analysis of the phonon frequencies and polarization vectors at the Γ point of the Brillouin zone for LaMnO 3 Pnma phase necessary for the interpretation of Raman and infrared spectra has been carried out. The analysis is based on group theoretical analysis as well as on a lattice dynamical calculation. The calculation has been made in the framework of the effective-charge- rigid-ion model by using the short-range Born-Mayer and long-range Coulomb potentials. A comparative study of phonon modes of LaMnO 3 (Pnma phase) and La 2CuO 4 (Cmca phase) has also been performed.
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