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VOLUME 75 (2002) | ISSUE 7 | PAGE 397
Subgap anomaly and above-energy-gap structure in chains of diffusive SNS junctions
PACS: 73.23.-b, 74.50.+r, 74.80.Fp
Abstract
We present the results of low-temperature transport measurements on chains of superconductor-normalconstriction-superconductor (SNS) junctions fabricated on the basis of superconducting PtSi film. A comparative study of the properties of the chains, consisting of 3 and 20 SNS junctions in series, and single SNS junctions reveals essential distinctions in the behavior of the current-voltage characteristics of the systems: (i) the gradual decrease of the effective suppression voltage for the excess conductivity observed at zero bias as the quantity of the SNS junctions increases, (ii) a rich fine structure on the dependences dV/dI-V at dc bias voltages higher than the superconducting gap and corresponding to some multiples of 2Δ/e. A model to explain this above-energy-gap structure based on energy relaxation of electron via Cooper-pair-breaking in superconducting island connecting normal metal electrodes is proposed.