This article is cited in 12 papers

CONDENSED MATTER

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

T. I. Baturina^a, D. R. Islamov^ab, Z. D. Kvon<sup>a

a</sup> Rzhanov Institute of Semiconductor Physics, Siberian Branch of Russian Academy of Sciences, Novosibirsk
^b Novosibirsk State University

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 $2\Delta/e$. 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.

PACS: 73.23.-b, 74.50.+r, 74.80.Fp

Received: 26.02.2002

Language: English

 English version: Journal of Experimental and Theoretical Physics Letters, 2002, 75:7, 326–330

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