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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| Affiliation: | (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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| Keywords: | 74.76.-W |
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