| Relation of Structure and Superconductivity in Self-Compensating Y1-χCaχBa2-χLaχCu3Oy |
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| 引用本文： | 孙学峰,玉静,王垡,张酣.Relation of Structure and Superconductivity in Self-Compensating Y1-χCaχBa2-χLaχCu3Oy[J].中国物理快报,2006,23(8):2221-2224. |
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| 作者姓名： | 孙学峰 玉静 王垡 张酣 |
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| 作者单位： | Materials Physics Laboratory, State Key Laboratory for Mesoscopic Physics, Department of Physics, Peking University, Beijing 100871 |
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| 基金项目： | Supported by the National Key Basic Research Special Foundation （NKBRSF） of China under Grant No G19990646. |
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| 摘 要： | The self-compensating compound of Y1-χ CaχBa2-χLaχ Cu3Oy is synthesized through a solid-state reaction method with χ from 0.25 to 0.55. Structural and superconducting properties have been investigated by χ-ray diffraction, Rietveld refinement, and dc magnetization measurement, respectively. The impure peaks appear when χ is more than 0.5 in the diffraction pattern. Orthorhombic-tetragonal transition occurs at χ = 0.45. Some local structural parameters, such as Cu（1）-O（4）, Cu（2）-O（4） bond lengths, change randomly in a narrow range. The relationship between the character of （Ba/La）-O plane and Tc is rather interesting. We attribute the behaviour of superconductivity to the joint effects of these local structural parameters. The results give the evidence that the influence of the structural change on superconductivity is essential and independent of carrier concentration.
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| 关 键 词： | 结构关系 超导电性 自修正 超导物理 |
| 收稿时间： | 2006-04-03 |
| 修稿时间： | 2006-04-03 |
Relation of Structure and Superconductivity in Self-Compensating Y1-xCaxBa2-xLaxCu3Oy |
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| SUN Xue-Feng,YU Jing,WANG Fa,ZHANG Han.Relation of Structure and Superconductivity in Self-Compensating Y1-xCaxBa2-xLaxCu3Oy[J].Chinese Physics Letters,2006,23(8):2221-2224. |
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| Authors: | SUN Xue-Feng YU Jing WANG Fa ZHANG Han |
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| Institution: | Materials Physics Laboratory, State Key Laboratory for Mesoscopic Physics, Department of Physics, Peking University, Beijing 100871 |
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| Abstract: | The self-compensating compound of Y1-xCaxBa2-xLaxCu3Oyis synthesized through a solid-state reaction method with x from 0.25 to 0.55. Structural and superconducting properties have been
investigated by x-ray diffraction, Rietveld refinement, and dc magnetization measurement, respectively. The impure peaks appear when x is more than 0.5 in the diffraction pattern. Orthorhombic--tetragonal transition occurs at x=0.45. Some local structural parameters, such as Cu(1)--O(4), Cu(2)--O(4) bond lengths, change randomly in a narrow range. The relationship between the character of (Ba/La)--O plane and Tc is rather interesting. We attribute the behaviour of superconductivity to the joint effects of these local structural parameters. The results give the evidence that the influence of the structural change on superconductivity is essential and independent of carrier concentration. |
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| Keywords: | 74 72 Bk 74 62 Bf 74 62 Dh 61 66 Fn |
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