Universal Distribution of Transparencies in Highly Conductive Nb/AlOx/Nb Junctions
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-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.
- Publication:
-
Physical Review Letters
- Pub Date:
- December 2000
- DOI:
- 10.1103/PhysRevLett.85.5404
- arXiv:
- arXiv:cond-mat/0006153
- Bibcode:
- 2000PhRvL..85.5404N
- Keywords:
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- Condensed Matter - Mesoscale and Nanoscale Physics;
- Condensed Matter - Superconductivity
- E-Print:
- 4 pages, 4 figures, references added