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Evidence for Supercurrent Quantization in Interfacial Josephson Junctions

B. W. Alphenaar
Hitachi Cambridge Laboratory, Cavendish Laboratory, Madingley Road, Cambridge CB3 0HE, UK

M. J. Black, H. Ahmed
University of Cambridge, Microelectronics Research Centre, Madingley Road, Cambridge CB3 0HE, UK

Abstract

            We observe a series of discontinuities in the above gap current-voltage characteristics of highly transmissive NbySi superconductor-semiconductor interfaces. The bias at which each switch occurs decreases in quantized steps as a function of temperature and magnetic field. The observed step size is the same for both dependencies. We propose that the steps correspond to supercurrent quantization through granular Josephson junctions formed near the interface.

M. J. Black, B. W. Alphenaar, and H. Ahmed, "Evidence for Supercurrent Quantization in Interfacial Josephson Junctions," Physical Review Letters 80 (3), 596-599 (January 1998)

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