Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2000-06-09
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
4 pages, 4 figures, references added
Scientific paper
10.1103/PhysRevLett.85.5404
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/AlO$_x$/Nb junctions with high specific conductance ($10^8$ Ohm$^{-1}$cm$^{-2}$). 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.
Averin Dmitri V.
Likharev Konstantin K.
Lukens James E.
Naveh Y.
Patel Vijay
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