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|Title:||Superconductivity and possible overdoping in Lu1-xCaxBa2Cu3O7-delta|
|Citation:||ZEITSCHRIFT FUR PHYSIK B-CONDENSED MATTER, 99(2), 173-177|
|Abstract:||Structural and superconducting properties of the system Lu1-xCaxBa2 CU3O7-delta, 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 (delta: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 of T-c due to divalent Ca-ions present in concentration x < 0.2. Our data indicate that this depression of T-c is likely due to overdoping effect.|
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