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We present the results of low-temperature transport measurements on chains ofsuperconductor--normal-constriction--superconductor (SNS) junctions fabricatedon the basis of superconducting PtSi film. A comparative study of theproperties of the chains, consisting of 3 and 20 SNS junctions in series, andsingle SNS junctions reveals essential distinctions in the behavior of thecurrent-voltage characteristics of the systems: (i) the gradual decrease of theeffective suppression voltage for the excess conductivity observed at zero biasas the quantity of the SNS junctions increases, (ii) a rich fine structure onthe dependences dV/dI-V at dc bias voltages higher than the superconducting gapand corresponding to some multiples of 2\Delta/e. A model to explain thisabove-energy-gap structure based on energy relaxation of electron viaCooper-pair-breaking in superconducting island connecting normal metalelectrods is proposed.Comment: RevTex, 5 pages, 4 figure

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