The effects of proton-induced defects, upon the properties of superconductor/non-superconductor Josephson junctions with Cu2.79Ba2Co0.21YO7 barriers, were investigated. It was noted that the resistance increased linearly, and the critical current decreased exponentially, with fluence. Changes in the current and resistance occurred only at fluences which would also reduce the critical temperature. The results indicated that point defects probably had little effect upon the uniformity of the current and resistance in junction arrays.

E.M.Jackson, B.D.Weaver, G.P.Summers: Applied Physics Letters, 1997, 71[2], 273-5