Physics – Condensed Matter – Superconductivity
Scientific paper
2010-09-07
Phys. Rev. Lett. 106, 097001 (2011)
Physics
Condensed Matter
Superconductivity
4 pages, 4 figures
Scientific paper
10.1103/PhysRevLett.106.097001
In highly resistive superconducting tunnel junctions, excess subgap current is usually observed and is often attributed to microscopic "pinholes" in the tunnel barrier. We have studied the subgap current in superconductor-insulator-superconductor (SIS) and superconductor-insulator-normal-metal (SIN) junctions. In Al/AlOx/Al junctions, we observed a decrease of 2 orders of magnitude in the current upon the transition from the SIS to the SIN regime, where it then matched theory. In Al/AlOx/Cu junctions, we also observed generic features of coherent diffusive Andreev transport in a junction with a homogenous barrier. We use the quasiclassical Keldysh-Green function theory to quantify single- and two-particle tunneling and find good agreement over 2 orders of magnitude in transparency. We argue that our observations rule out pinholes as the origin of the excess current.
Bauch Thilo
Delsing Per
Greibe Tine
Shumeiko Vitaly S.
Stenberg Markku P. V.
No associations
LandOfFree
Are pinholes the cause of excess current in superconducting tunnel junctions? A study of Andreev current in highly resistive junctions does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Are pinholes the cause of excess current in superconducting tunnel junctions? A study of Andreev current in highly resistive junctions, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Are pinholes the cause of excess current in superconducting tunnel junctions? A study of Andreev current in highly resistive junctions will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-704553