Universal distribution of transparencies in highly conductive Nb/AlOx/Nb junctions
Y. Naveh, Vijay Patel, D. V. Averin, K. K. Likharev, J. E. Lukens
Abstract
We report the observation of the universal distribution of transparencies, predicted by Schep and Bauer [Phys. Rev. Lett. 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.
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