Coherence between superconducting edge states in superconducting periodic arrays of artificial defects

Details Coherence between superconducting edge states in superconducting periodic arrays of artificial defects Coherence between superconducting edge states in superconducting periodic arrays of artificial defects

1999-05-25

arxiv.org/abs/cond-mat/9905366v2

Physics

Condensed Matter

Superconductivity

revised version, fig.4 changed 23 pages, 7 figures, submitted to Journal of Low Temperature Physics

Scientific paper

The transition line of superconducting arrays of holes exhibits a rich field structure due to the interference of superconducting states nucleated at the holes edges. We studied by means of resistance measurements their effect on the T*c(H) line as a function of transverse magnetic field using regular arrays of nanofabricated micron size holes. The arrays transition fields are higher than for the bulk. Moreover we found a nontrivial field modulation of the T*c(H) line with an inversion, with increasing field, of the modulation concavity which we assigned to a crossover from a collective to an isolated edge state regime. The high field regime is well described by the nucleation at a single hole in an infinite film. The modulation at low fields was found to be dominated by the interference of neighbor edge states when the inter-hole distance w becomes comparable to the temperature dependent coherence length. A comparison between arrays of different hole shape shows the influence of geometry on the type of interaction established, which can described either as a superconducting wire network or as a weak link array.

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