| Original Articles |
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Relation of Structure and Superconductivity in Self-Compensating Y1-xCaxBa2-xLaxCu3Oy |
| SUN Xue-Feng;YU Jing;WANG Fa;ZHANG Han |
| Materials Physics Laboratory, State Key Laboratory for Mesoscopic Physics, Department of Physics, Peking University, Beijing 100871 |
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| Cite this article: |
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SUN Xue-Feng, YU Jing, WANG Fa et al 2006 Chin. Phys. Lett. 23 2221-2224 |
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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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Published: 01 August 2006
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| PACS: |
74.72.Bk
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74.62.Bf
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(Effects of material synthesis, crystal structure, and chemical composition)
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74.62.Dh
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(Effects of crystal defects, doping and substitution)
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61.66.Fn
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(Inorganic compounds)
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