Singular length dependence of critical current in SNS bridges

Details Singular length dependence of critical current in SNS bridges Singular length dependence of critical current in SNS bridges

2006-01-09

arxiv.org/abs/cond-mat/0601177v2

Phys. Rev. B 74, 212509 (2006)

Physics

Condensed Matter

Superconductivity

4 pages, 1 figure

Scientific paper

We examine dependence of the critical Josephson current on the length L of the normal bridge N between two bulk superconductors. This dependence turns out to be nonanalytic at small L. The nonanalyticity originates from the contribution of extended quasiparticle states with energies well above the superconducting gap. This should be contrasted with the more familiar contribution to the Josephson current coming from Andreev bound states localized in the normal region at energies below the gap.

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