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Observation of integer and fractional giant Shapiro steps in arrays of SNS Josephson junctions

✍ Scribed by H.C. Lee; D.B. Mast; R.S. Newrock; L. Bortner; K. Brown; F.P. Esposito; D.C. Harris; J.C. Garland

Publisher: Elsevier Science
Year: 1990
Tongue: English
Weight: 362 KB
Volume: 165-166
Category: Article
ISSN: 0921-4526
DOI: 10.1016/s0921-4526(09)80371-2

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✦ Synopsis

We observe giant Shapiro steps in the I-V curves of NxM arrays of SNS Josephson junctions; these steps occur at N times the single junction voltage. Both integer and fractional giant steps are observed as a function of temperature, external magnetic field, and rf current. The fractional steps occur at multiples of l/q times the giant Shapiro step voltage and are seen at well defined values of the applied field, p/q flux quantum per placquette. We also observe a fractional step at 1/2 integer voltages, even in zero applied field. These fractional steps decrease in size if random site disorder is introduced to the array.

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