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Subgap anomaly and above-energy-gap structure in chains of diffusive SNS junctions

Tatyana. I. Baturina·D. R. Islamov·Z. D. Kvon
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Abstract

We present the results of low-temperature transport measurements on chains of superconductor--normal-constriction--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 electrods is proposed.

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Tatyana. I. Baturina, D. R. Islamov, Z. D. Kvon. 2002-02-26. Subgap anomaly and above-energy-gap structure in chains of diffusive SNS junctions. https://doi.org/10.1134/1.1485261

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