Pb/sub 1-x/Bi/sub x//Bi/Pb/sub 1-x/Bi/sub x/ Josephson junction

A superconductor/semimetal/superconductor (S/SM/S) Josephson junction has been developed. We have used an alloy of Pb/sub 1-x/Bi/sub x/ (0 less than or equal to x less than or equal to 0.6) as the superconductor and Bi as the semimetal. By irradiating at X-band microwave of 10 GHz, Shapiro steps were observed for various bismuth barrier thicknesses theta in /angstroms/ and bismuth weight ratios x. Finally, we obtained the empirical relationship for barrier thickness, below which microwaves could be detected for various bismuth weight ratios x at the temperature of 4.2 K.