Characterization of Y-Ba-Cu-O superconducting thin films prepared by coevaporation of Y, Cu, and BaF2

Garzon, F. H.; Beery, J. G.; Brown, D. R.; Sherman, R. J.; Raistrick, I. D.
April 1989
Applied Physics Letters;4/3/1989, Vol. 54 Issue 14, p1365
Academic Journal
We have studied the effect of varying the postdeposition anneal conditions on the properties of thin films of YBa2Cu3O7 prepared by coevaporation from Y, Cu, and BaF2. The temperature of this processing step determines both the microstructure of the films and the constituent phases. At low temperatures, BaF2 is incompletely reacted and the predominant superconducting phase is Y2Ba4Cu8O20-x. At higher temperatures, the equilibrium distribution of phases, which includes YBa2Cu3O7, is formed. As the temperature is raised, the texture of the films also changes. The thermodynamics of the formation reaction and of the reaction between YBa2Cu3O7 and various substrate materials is discussed.


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