Dependence of global superconductivity on inter-island coupling in arrays of long SNS junctions

Serena Eley, Sarang Gopalakrishnan, Paul M. Goldbart, Nadya Mason

Research output: Contribution to journalArticle

Abstract

We present measurements of the superconducting transition temperature, Tc, for arrays of mesoscopic Nb islands patterned on Au films, for large island spacings d. We show that Tc ∼ 1/d2, and explain this dependence in terms of the quasiclassical prediction that the Thouless energy, rather than the superconducting gap, governs the inter-island coupling at large spacings. We also find that the temperature dependence of the critical current, Ic (T), in our arrays is similar to that of single SNS junctions. However, our results deviate from the quasiclassical theory in that Tc is sensitive to island height, because the islands are mesoscopic.

Original languageEnglish (US)
Article number445701
JournalJournal of Physics Condensed Matter
Volume25
Issue number44
DOIs
StatePublished - Nov 6 2013

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

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