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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Gnanasekar, K.I., Sharon, M., Pinto, R. et al. Superconductivity and possible overdoping in Lu1−x Ca x Ba2Cu3O7−δ . Z. Phys. B - Condensed Matter 99, 173–177 (1995). https://doi.org/10.1007/s002570050025
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DOI: https://doi.org/10.1007/s002570050025