Abstract
The AC Josephson effect has been observed in Nb3Sn variable thickness bridges, at liquid hydrogen temperatures. The microwave radiation power dependence of the critical current and the current steps height have been studied. The results are in agreement with a theory based on vortex motion in the superconducting thin-film bridges. We consider these results as indicating good prospects for the use of high temperature superconducting alloys in cryogenic electronics.
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