Superconductivity and possible overdoping in Lu1?x
Ca
x
Ba2Cu3O7?δ |
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| Authors: | K I Gnanasekar M Sharon R Pinto A S Tamhane S C Purandare S P Pai L C Gupta R Vijayaraghavan |
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| Institution: | 1. Department of Chemistry, Indian Institute of Technology, 400076, Bombay, India
2. Tata Institute of Fundamental Research, Homi Bhabha Road, 400 005, Bombay, India
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| Abstract: | Structural and superconducting properties of the system Lu1?x Ca x Ba2 Cu3O7?δ, both in bulk as well as thin film form, have been investigated. Presence of large Ca-ions at the Lu-sites is responsible for phase stability (in 1–2–3 phase) in bulk. In argon annealed tetragonal samples (δ:1) superconductivity is reinstated as in these samples, presence of Ca-ions lead to the generation of holes in the Cu?O planes. In oxygen annealed bulk samples and thin films, there is a large depression ofT c due to divalent Ca-ions present in concentrationx<0.2. Our data indicate that this depression ofT c is likely due to overdoping effect. |
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