| Original Articles |
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Reconsideration of Orth I and Orth II Phases in Ln-System Superconductors |
| LIU Yue-Wei;WANG Lu;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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LIU Yue-Wei, WANG Lu, ZHANG Han 2006 Chin. Phys. Lett. 23 453-455 |
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Abstract A block model is used to calculate the combinative energy in LnBa2Cu3O7-x (Ln=Y, Er, Nd) systems, and the energy has no difference for orth-I and orth-II in the plateau range. Namely, no matter what phase it is, when the oxygen deficiency is in the range of δ～0.35--0.55, the plateau appears in the energy -δ curves, and the combinative energy has close correlation with the Tc value. The result in the present work gives some hints to reconsider the role of the order of oxygen defects or its effect on superconductivity in LnBa2Cu3O7-x. The existence of the orth-II seems not to be the reason for the plateau in the Tc curve. This is an important problem for LnBa2Cu3O7-x and some suggestion is given in the discussion.
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| Keywords:
74.72.Dn
61.50.Lt
74.62.Dh
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Published: 01 February 2006
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| PACS: |
74.72.Dn
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61.50.Lt
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(Crystal binding; cohesive energy)
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74.62.Dh
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(Effects of crystal defects, doping and substitution)
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