Title :
Deposition and characterization of Y1-xCaxBa2Cu3O7-δ epitaxial thin films
Author :
Cancellieri, C. ; Augieri, A. ; Boffa, V. ; Celentano, G. ; Ciontea, L. ; Fabbri, F. ; Galluzzi, V. ; Gambardella, U. ; Grassano, G. ; Petrisor, T. ; Tebano, R.
Author_Institution :
Ecole Polytechnique Federale de Lausanne, Switzerland
fDate :
6/1/2005 12:00:00 AM
Abstract :
We report on the superconducting properties of epitaxial thin films Y1-xCaxBa2Cu3O7-y with 0≤x≤0.2, grown on SrTiO3 [001] by Pulsed Laser Deposition (PLD) technique. The partial substitution of Ca2+ at the Y3+site in YBCO leads to a monotonic decrease of the zero resistance critical temperature, Tc. The oxygen stoichiometry is varied by means of post-deposition thermal treatment varying the oxygen partial pressure. The dependence of Tc on annealing oxygen pressure can be attributed to an overdoping effect and/or to a cation disorder.
Keywords :
barium compounds; crystal chemistry; epitaxial growth; high-temperature superconductors; pulsed laser deposition; strontium compounds; superconducting epitaxial layers; superconducting transition temperature; titanium compounds; yttrium compounds; Ca substitution; PLD technique; SrTiO3; YBCO; YCaBa2Cu3O7; annealing oxygen pressure; cation disorder; epitaxial thin films; oxygen partial pressure; oxygen stoichiometry; post-deposition thermal treatment; pulsed laser deposition; superconducting properties; zero resistance critical temperature; Annealing; Calcium; Laser ablation; Optical pulses; Pulsed laser deposition; Sputtering; Superconducting epitaxial layers; Superconducting thin films; Temperature; Yttrium barium copper oxide; Annealing; Ca substitution; PLD; YBCO; critical temperature;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
DOI :
10.1109/TASC.2005.848716
