Structural properties and Raman spectroscopy of La_(2+4x)/3Sr_(1−4x)/3Mn_1−xCu_xO₃ (0x0.2)

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• 作者：W.J. Li ; Bo Zhang ; W. Lu
• 关键词：Raman spectroscopy ; Perovskite manganites ; Colossal magnetoresistance
• 刊名：Physics Letters A
• 出版年：2007
• 期刊代码：57_03759601
• 类别：ph
• 出版时间：5 March 2007
• 卷：362
• 期：4
• 页码：327-330
• 文件大小：262 K

摘要

We present the results of the Rietveld refinement of X-ray powder diffraction and Raman spectroscopy of samples La_(2+4x)/3Sr_(1−4x)/3Mn_1−xCu_xO₃ a1" title="Click to view the MathML source">(0x0.2) with the Mn³⁺/Mn⁴⁺ ratio fixed at . By comparing with the Raman spectra of the single doping samples La_2/3Sr_1/3Mn_1−xCu_xO₃, we found, for the same Mn³⁺/Mn⁴⁺ ratio these spectra start exhibiting some new features following with the increasing concentration of Cu substitutions. Moreover, we also have observed that the A_1g mode is substantially shifted with increasing Cu substitution. The A_1g phonon mode depends linearly on the A-site mismatch factor σ², which is influenced mainly by the variety of the r_A.