We observe a series of discontinuities in the above gap current/voltage characteristics of highly transmissive Nb/Si 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.
@article{arxiv.cond-mat/9707071,
title = {Evidence for Supercurrent Quantization in Interfacial Josephson Junctions},
author = {M. J. Black and B. W. Alphenaar and H. Ahmed},
journal= {arXiv preprint arXiv:cond-mat/9707071},
year = {2009}
}
Comments
Submitted to PRL 8 pages, 4 figures. Text file is paper.tex and Figs. 1 - 4 are GIF files