Author： Look L. Van Rosseel E. Bael M. J.Van Bruynseraede Y. Moshchalkov V. V.
Publisher： Taylor & Francis Ltd
ISSN： 1463-6417
Source： Philosophical Magazine B, Vol.80, Iss.5, 2000-05, pp. : 847-856
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Abstract
Shapiro voltage steps at voltages Vn = nV0 occur in the voltage-current characteristics of a superconducting film with a periodic pinning potential in the presence of rf radiation. We report on their experimental observation in a superconducting film with a square lattice of perforated microholes (antidots) and on numerical simulations showing the Shapiro steps in the voltage-current characteristics of the dc flux transformer. For the square antidot lattice, the ratio V0/upsilon of the step height to the applied rf frequency depends on the antidot lattice period d , while in the flux transformer geometry this ratio can be tuned by the magnetic field. This tuneability of the resolution makes the flux transformer a good candidate for applications (e.g. broad-band radiation detection).
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