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Proceedings Paper

Raman active phonons in RMnO3 (R=La, Pr, Nd, Sm) manganites
Author(s): Wei-Ran Wang; Geng-Xin Song; Yan Zhao; Xue-Ying Han
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Paper Abstract

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.

Paper Details

Date Published: 21 May 2009
PDF: 4 pages
Proc. SPIE 7282, 4th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Advanced Optical Manufacturing Technologies, 72822R (21 May 2009); doi: 10.1117/12.830999
Show Author Affiliations
Wei-Ran Wang, Northeast Dianli Univ. (China)
Geng-Xin Song, Jilin Univ. (China)
Yan Zhao, Northeast Dianli Univ. (China)
Xue-Ying Han, Northeast Dianli Univ. (China)


Published in SPIE Proceedings Vol. 7282:
4th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Advanced Optical Manufacturing Technologies
Li Yang; John M. Schoen; Yoshiharu Namba; Shengyi Li, Editor(s)

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