Relation of structure and superconductivity in self-compensating Y 1-xCaxBa2-xLaxCu3O y

被引：3
作者：
Department of Physics, Materials Physics Laboratory, Peking University, Beijing 100871, China [1 ]
机构：
[1] Department of Physics, Materials Physics Laboratory, Peking University
来源：
Chin. Phys. Lett. | 2006年 / 8卷 / 2221-2224期
关键词：
Rietveld refinement - Barium compounds - Carrier concentration - Solid state reactions;
D O I：
10.1088/0256-307X/23/8/071
中图分类号：
学科分类号：
摘要：
The self-compensating compound of Y1-xCaxBa 2-xLaxCu3Oy is 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. © 2006 Chinese Physical Society and IOP Publishing Ltd.
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页码：2221 / 2224
页数：3
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