Shapiro steps in a superconducting film with an antidot lattice

Details Shapiro steps in a superconducting film with an antidot lattice Shapiro steps in a superconducting film with an antidot lattice

1999-07-27

arxiv.org/abs/cond-mat/9907410v1

Physics

Condensed Matter

Superconductivity

6 pages text, 3 EPS figures, RevTeX, accepted for publication in PRB Rapid Communications

Scientific paper

10.1103/PhysRevB.60.R6998

Shapiro voltage steps at voltages V_n=nV_0 (n integer) have been observed in the voltage-current characteristics of a superconducting film with a square lattice of perforating microholes (antidots)in the presence of radiofrequent radiation. These equidistant steps appear at the second matching field H_2 when the flow of the interstitial vortex lattice in the periodic potential created by the antidots and the vortices trapped by them, is in phase with the applied rf frequency. Therefore, the observation of Shapiro steps clearly reveals the presence of mobile intersitial vortices in superconducting films with regular pinning arrays. The interstitial vortices, moved by the driving current, coexist with immobile vortices strongly pinned at the antidots.

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