Preparation of Y2Ba4Cu8O20-x thin films by thermal coevaporation

Berkley, D. D.; Kim, D. H.; Johnson, B. R.; Goldman, A. M.; Mecartney, M. L.; Beauchamp, K.; Maps, J.
August 1988
Applied Physics Letters;8/22/1988, Vol. 53 Issue 8, p708
Academic Journal
We report on the preparation of Y2Ba4Cu8O20-x (‘‘248’’) thin films by coevaporation using a combination of electron beam and Knudsen cell vapor sources. Our best film shows a superconducting onset at 80 K and zero resistance at 72 K. The x-ray diffraction patterns show nearly single phase ‘‘248’’ with a small YBa2Cu3O7-x (‘‘123’’) impurity. It has been our experience that films can be annealed at least twice without displaying any shift in diffraction peak position.


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