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Linear ac response of diffusive SNS junctions

AuthorsBergeret, F. S.
Issue Date2011
PublisherAmerican Physical Society
CitationPhysical Review B 83(14): 144514 (2011)
AbstractWe explore the behavior of the ac admittance of superconductor–normal-metal–superconductor (SNS) junctions as the phase difference of the order parameters between the superconductors is varied. We find three characteristic regimes, defined by comparison of the driving frequency ω to the inelastic scattering rate Γ and the Thouless energy ET of the junction (typically ℏΓ≪ET). Only in the first regime ω≪Γ does the usual picture of the kinetic inductance hold. We show that the ac admittance can be used to directly access some of the characteristic quantities of the SNS junctions, in particular the phase-dependent energy minigap and the typically phase-dependent inelastic scattering rate. Our results partially explain the recent measurements of the linear response properties of SNS superconducting quantum interference devices (SQUIDs) and predict a number of new effects.
Description5 páginas, 4 figuras.-- PACS number(s): 74.45.+c, 74.25.N−, 74.50.+r.-- et al.
Publisher version (URL)http://dx.doi.org/10.1103/PhysRevB.83.144514
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