Multiple Andreev reflection in MgB2/MgO/MgB2 Josephson junctions
Abstract
The current-voltage and conductance-voltage characteristics of MgB2/MgO/MgB2 junctions made with MgB2 electrodes grown by hybrid physical-chemical vapor deposition were systematically analyzed. In the junctions with different sizes and critical current densities, we found excess current and subharmonic gap structure indicative of multiple Andreev reflection. An apparent link between multiple Andreev reflection and substantial Josephson current at high temperatures suggests that the barrier is dominated by high-transparency channels.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Mar 19, 2012
- Source ID
- 10.1063/1.3695159
Entities
People
- Alan W. Kleinsasser
- Daniel Cunnane
- John M. Rowell
- Ke Chen
- X. X. Xi
- Yi Shen
Organizations
- Arizona State University
- Office of Naval Research
- Temple University