SUBGAP CHARACTERISTICS OF NB ALOX/NB TUNNEL-JUNCTIONS WITH HIGH CRITICAL-CURRENT DENSITY/

Authors
MAEZAWA M AOYAGI M NAKAGAWA H KUROSAWA I TAKADA S
Citation
M. Maezawa et al., SUBGAP CHARACTERISTICS OF NB ALOX/NB TUNNEL-JUNCTIONS WITH HIGH CRITICAL-CURRENT DENSITY/, IEEE transactions on applied superconductivity, 5(2), 1995, pp. 3073-3076
Citations number
14
Categorie Soggetti
Engineering, Eletrical & Electronic","Physics, Applied
Journal title
IEEE transactions on applied superconductivity → ACNP
ISSN journal
10518223
Volume
5
Issue
2
Year of publication
1995
Part
3
Pages
3073 - 3076
Database
ISI
SICI code
1051-8223(1995)5:2<3073:SCONAT>2.0.ZU;2-R
Abstract
We have investigated subgap characteristics of Nb/AlOx/Nb tunnel junct ions with high critical current density (high-J(c)). A good agreement of the experimental data with the solution of Werthamer's equation cle arly shows that steep current steps observed at odd submultiples of th e gap voltage, which cannot be explained by multiparticle tunneling an d/or multiple Andreev reflection, are mainly caused by Josephson self- coupling. Our experimental results suggest that Josephson self-couplin g is important to high-J(c) tunnel junctions.