We report the observation of the universal distribution of transparencies, predicted by Schep and Bauer [Phys. Rev. Lett. {\bf 78}, 3015 (1997)] for dirty sharp interfaces, in uniform Nb/AlOx/Nb junctions with high specific conductance (108 Ohm−1cm−2). Experiments used the BCS density of states in superconducting niobium for transparency distribution probing. Experimental results for both the dc I−V curves at magnetic-field-suppressed supercurrent and the Josephson critical current in zero magnetic field coincide remarkably well with calculations based on the multimode theory of multiple Andreev reflections and the Schep-Bauer distribution.
@article{arxiv.cond-mat/0006153,
title = {Universal distribution of transparencies in highly conductive Nb/AlO$_x$/Nb junctions},
author = {Y. Naveh and Vijay Patel and D. V. Averin and K. K. Likharev and J. E. Lukens},
journal= {arXiv preprint arXiv:cond-mat/0006153},
year = {2009}
}