1Department of Physics, Jilin University, Changchun 130023
2Northeast China Institute of Electric Power Engineering, Jilin 132012
3Centre for the Condensed-Matter Science and Technology, Harbin Institute of Technology, Harbin 150001
4International Centre for Materials Physics, Chinese Academy of Sciences, Shenyang 110015
1Department of Physics, Jilin University, Changchun 130023
2Northeast China Institute of Electric Power Engineering, Jilin 132012
3Centre for the Condensed-Matter Science and Technology, Harbin Institute of Technology, Harbin 150001
4International Centre for Materials Physics, Chinese Academy of Sciences, Shenyang 110015
Abstract： Raman-active phonons in orthorhombic perovskite-like RMnO3 were studied by measuring Raman spectra in various scattering configurations. The experimental Raman line wave numbers and the expected shapes for the phonon modes were compared to those reported for other perovskite-like compounds with the Pnma structure and to the results of lattice dynamical calculations. The observed Raman lines in the spectra of RMnO3 were assigned to definite atomic motions. The remaining spectral weight can be explained by the presence of dynamic John--Teller distortions that lower the symmetry of the cubic perovskite.
2005, Vol. 22 
