| Raman Active Phonons in RCoO3 （R=La, Ce, Pr, Nd, Sm, Eu, Gd, and Dy） Perovskites |
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| 引用本文： | 王巍然,许大鹏,苏文辉,丁战辉,薛燕锋,宋更新.Raman Active Phonons in RCoO3 （R=La, Ce, Pr, Nd, Sm, Eu, Gd, and Dy） Perovskites[J].中国物理快报,2005,22(9):2400-2402. |
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| 作者姓名： | 王巍然 许大鹏 苏文辉 丁战辉 薛燕锋 宋更新 |
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| 作者单位： | [1]Department of Physics, Jilin University, Changchun 130023 [2]Northeast China Institute of Electric Power Engineering, Jilin 132012 [3]Center for the Condensed-Matter Science and Technology, Harbin Institute of Technology, Harbin 150001 [4]International Center for Materials Physics, Chinese Academy of Sciences, Shenyang 110015 |
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| 基金项目： | Supported by the National Natural Science Foundation of China under Grant No 30370406. |
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| 摘 要： | We examine RCoO3 （R=La, Ce, Pr, Nd, Sin, Eu, Gd, and Dy） perovskites prepared with the solid-state reaction method by Raman spectroscopy, and report the Raman active phonons in the RCoO3 perovskites crystallized in cubic symmetry for RCoO3 （R=La, Ce, Pr and Nd） and orthorhombic symmetry for RCoO3 （R=Sm, Eu, Gd, and Dy）. It is found that the Raman spectra of RCoO3 perovskites are strongly dependent on the ionic radius of the rare earth elements, and the frequency shift of the most intense modes of the orthorhombic samples are correlated with some structural parameters such as Co-O bond distances, ionic radius of the rare earth elements and Jahn-Teller distortion. It is clear that Raman spectroscopy has the advantage of sensitivity to structure distortion and oxygen motion.
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| 关 键 词： | 光谱学 声子 钙铁矿 晶体 对称性 Raman光谱 |
| 收稿时间： | 2005-03-29 |
| 修稿时间： | 2005-03-29 |
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