, Volume 44, Issue 3-4, pp 283-293

Distorted steps in the I-V characteristic of Josephson junctions

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Observation of distorted steps (“wiggle-like” structure) in the I-V characteristic of Pb/In-oxide-Pb and other Josephson junctions subjected to microwave radiation is reported. Such structure is also found with an electronic analog based on the R(C)SJ model if the Stewart-McCumber parameter β c % MathType!MTEF!2!1!+-% feaafeart1ev1aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn% hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr% 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq-Jc9% vqaqpepm0xbba9pwe9Q8fs0-yqaqpepae9pg0FirpepeKkFr0xfr-x% fr-xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaeqOSdi2aaS% baaSqaaiaadogaaeqaaOGafyOpa4JbaGaacaaIWaGaaiOlaiaaiwda% aaa!3BED!\[\beta _c \tilde > 0.5\]0.5 and simultaneously the Hamilton-Johnson condition for substeps, Ω rCR∼-1, is fulfilled. The frequency spectrum of the analog's Josephson oscillation exhibits new lines and considerable noise when wiggles appear.

On leave from Yamagata University, Yonezawa, Japan.