Observation of local crystal structure change in (CaxLa1-x)(Ba1.75-xLa0.25+x) Cu3O7+δ tetragonal superconductor using Raman scattering

被引：0

作者：

Sato, Yasushi ^{[1
]}

Yoshioka, Kohtaro ^{[1
]}

Petrykin, Valery ^{[1
]}

Kakihana, Masato ^{[1
]}

Tanaka, Yoshito ^{[1
]}

Yamaguchi, Ai ^{[1
]}

Katsumata, Takahiro ^{[1
]}

Yasuoka, Hiroshi ^{[1
]}

机构：

[1] Materials and Structures Laboratory, Tokyo Institute of Technology, 4259 Nagatsuta Midori-ku, Yokohama 226-8503, Japan

来源：

Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy | 2002年 / 49卷 / 05期

关键词：

Crystal defects - Crystal structure - Crystal symmetry - High temperature superconductors - Mathematical models - Molecular vibrations - Polycrystalline materials - Raman scattering - Yttrium barium copper oxides;

D O I：

10.2497/jjspm.49.372

中图分类号：

学科分类号：

摘要：

Polycrystalline samples of (CaxLa1-x)(Ba1.75-xLa0.25+x)Cu3 O7+δ (CLBCO) tetragonal superconductor for x from 0.0 to 0.6 were studied by Raman scattering technique, which is sensitive to oxygen site symmetry in the high-Tc superconductors. On the Raman spectra, five extra modes at 200, 320, 400, 565 and 610 cm-1, which did not appear on Raman spectra of tetragonal YBa2Cu3O6, were observed. Based on the model that apical oxygen O(4) is displaced by La3+ on Ba site and the result of group theoretical analysis for this model, the 565 cm-1 mode which possessed the strongest intensity among these extra modes could be assigned to another O(4) vibration. This indicates that O(4) is strongly attracted by La3+ on Ba site, resulting in a change of local structure.

引用

页码：372 / 376

共 41 条

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