Controllable reduction of critical currents in YBa2Cu3O7-δ films

White, Alice E.; Short, K. T.; Dynes, R. C.; Levi, A. F. J.; Anzlowar, M.; Baldwin, K. W.; Polakos, P. A.; Fulton, T. A.; Dunkleberger, L. N.
September 1988
Applied Physics Letters;9/12/1988, Vol. 53 Issue 11, p1010
Academic Journal
The critical currents in high quality thin films of the high T[sub c] superconductor, YBa[sub 2]Cu[sub 3]O[sub 7-δ], can be controllably reduced by orders of magnitude using ion irradiation. This reduction in critical current occurs without substantial decrease in T[sub c] or increase in room-temperature resistivity. Using this technique, we have fabricated weak links that exhibit an ac Josephson effect at 77 K.


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