| Eu(Pr)替代Ba位对EuBa2Cu3O7-δ晶体结构及其超导电性的影响 |
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| 引用本文： | 彭振生,王智河.Eu(Pr)替代Ba位对EuBa2Cu3O7-δ晶体结构及其超导电性的影响[J].光谱学与光谱分析,2004,24(4):451-454. |
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| 作者姓名： | 彭振生 王智河 |
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| 作者单位： | 1. 宿州师范专科学校物理系,安徽,宿州,234000
2. 南京大学物理系固体微结构实验室,江苏,南京,214100 |
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| 基金项目： | 国家自然科学基金重点项目 (No .1 99340 0 3)，国家重点基础研究发展规划项目 (No .0 0 1CB61 0 60 4 )资助 |
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| 摘 要： | 采用X射线衍射、直流输运和拉曼光谱法分别研究了Pr和Eu替代EuBa2 Cu3O7 δ的Ba位对晶体结构及其超导电性的影响。实验结果表明 ,随着Pr和Eu替代浓度的增加 ,晶体结构发生了从正交相到四方相的结构转变 ,超导临界温度Tc 迅速降低 ,拉曼光谱表明 ,随着替代含量的增加 ,Cu(1)—O(4 )的拉伸振动 5 0 4cm- 1 和Cu(2 )—O(2 ,3)反相弯曲的振动模 30 4cm- 1 系统地向高波数移动。
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| 关 键 词： | 高温超导 结构转变 元素替代法 |
| 文章编号： | 1000-0593(2004)04-0451-04 |
| 修稿时间： | 2003年11月16 |
Effect of Eu(Pr) Substitution at Ba Sites on Microstructure and Superconductivity in EuBa2Cu3O7-δ Ceramics |
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| PENG Zhen-sheng ,WANG Zhi-he . Suzhou Normal College,Physics.Effect of Eu(Pr) Substitution at Ba Sites on Microstructure and Superconductivity in EuBa2Cu3O7-δ Ceramics[J].Spectroscopy and Spectral Analysis,2004,24(4):451-454. |
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| Authors: | PENG Zhen-sheng WANG Zhi-he Suzhou Normal College Physics |
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| Institution: | Suzhou Normal College, Physics Department, Suzhou 234000, China. |
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| Abstract: | Ceramics of Eu1+xBa2-xCu3O7-delta with x = 0.0, 0.05, 0.1, 0.2, 0.3, 0.4, 0.5 and EuBa2-xPrxCu3O7-delta with x=0.0, 0.05, 0.1, 0.2, 0.3, 0.4 have been synthesized and investigated by X-ray diffraction, resistivity, and Raman spectroscopy. The results show that the transition of crystal structure from orthorhombic to tetragonal occurs and the criticaltemperature decreases withthe increase in doping concentration x. The Raman spectra show that the frequency of the Cu(1)-O(4) stretching mode andthe Cu(2)-(2, 3) out-of-phase mode shifts to higher wave number with increasing doping concentration x. |
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| Keywords: | High-temperature superconduction Structure transition Method of element substitution |
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