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TitleDoping dependence of the critical current and irreversibility field in Y1-xCaxBa2Cu3O7-δ
Publication TypeJournal Article
Year of Publication2004
AuthorsSemwal, A., Strickland N.M., Bubendorfer A., Naqib S.H., Goh S.K., and Williams G.V.M.
JournalSuperconductor Science and Technology
PaginationS506 - S510
Date Published2004
ISSN09532048 (ISSN)
KeywordsAnnealing, Critical current density (superconductivity), Doping (additives), High temperature superconducting cuprates (HTSC), Irreversibility fields, Pulsed laser deposition, Sol-gels, Superconducting condensate density, Thermal effects, Thin films, Yttrium barium copper oxides
AbstractCritical current measurements were made on thin films of YBa 2Cu3O7-δ and Y0.8Ca 0.2Ba2Cu3O7-δ produced by sol-gel and pulsed laser deposition, respectively. Both samples have high critical currents at low temperatures and the critical current, Jc, is largest in the overdoped Y0.8Ca0.2Ba2Cu 3O7-δ thin film. Annealing studies show a large increase in Jc with increasing hole concentration and suggests that the maximum Jc should occur for overdoped samples. The very overdoped region of the superconducting phase diagram was probed by studying bulk ceramic Y0.8Ca0.2Ba2Cu3O 7-δ samples, where it was found that the irreversibility field systematically increases with increasing hole concentration when scaled by the reduced temperature (τ = (1 - T / Tc)).

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