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RMnO3 (R=La, Pr, Nd, Sm) Manganites prepared using solid-state reaction method were examined by Raman
spectroscopy. Raman-active phonons in orthorhombic perovskitelike 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 perovskitelike compounds with 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. It is clear that Raman spectroscopy has the advantage of being very sensitive to
structure distortion and oxygen motion.
Wei-Ran Wang,Geng-Xin Song,Yan Zhao, andXue-Ying Han
"Raman active phonons in RMnO3 (R=La, Pr, Nd, Sm) manganites", Proc. SPIE 7282, 4th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Advanced Optical Manufacturing Technologies, 72822R (21 May 2009); https://doi.org/10.1117/12.830999
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Wei-Ran Wang, Geng-Xin Song, Yan Zhao, Xue-Ying Han, "Raman active phonons in RMnO3 (R=La, Pr, Nd, Sm) manganites," Proc. SPIE 7282, 4th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Advanced Optical Manufacturing Technologies, 72822R (21 May 2009); https://doi.org/10.1117/12.830999