Superconducting Tl-Ca-Ba-Cu-O thin films with zero resistance at temperatures of up to 120 K

Lee, W. Y.; Lee, V. Y.; Salem, J.; Huang, T. C.; Savoy, R.; Bullock, D. C.; Parkin, S. S. P.
July 1988
Applied Physics Letters;7/25/1988, Vol. 53 Issue 4, p329
Academic Journal
We have prepared superconducting Tl-Ca-Ba-Cu-O thin films on a variety of substrates with transition temperatures as high as [bar_over_tilde:_approx._equal_to]120 K, confirmed by sharp onsets of substantial Meissner and shielding signals at the same temperatures. The properties of the films are found to depend sensitively on the post-annealing conditions. Highly textured c-axis-oriented films comprised mostly of Tl2Ca1Ba2Cu2Ox, Tl1Ca2Ba2Cu3Ox, and Tl2Ca2Ba2Cu3Ox were synthesized by varying the annealing procedure with corresponding maximum superconducting transition temperatures of [bar_over_tilde:_approx._equal_to]100, 110, and 120 K, respectively.


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