Unusual Commensurability Effect in Superconducting Sn Films with Triangular Lattice of Microholes
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The interaction of the magnetic field with superconducting Sn perforated films prepared by electron beam lithography was studied. Shift of the peaks in the critical current I c from integral multiples of the matching field was observed. An approach based on existence of the excited vortex lattice states is proposed to explain the effect. Some energetically unfavorable vortex states are stable in the structures made of superconducting films with strong interaction of the vortices with defect in the films. By using the approach it is possible to explain the unusual matching effect, and other results obtained in the present paper.