Using Zr oxide for the tunnel barrier formation, it is shown experimentally that the effect of pinholes is suppressed in the double-barrier versus single-barrier junction configuration. It is found that Josephson current in NbZr double-barrier junctions is much lower than in NbAl junctions with comparable specific tunneling resistance and middle layer thickness. Multiple oxidation process is used to improve the quality of superconductor-insulator- superconductor Zr-based junctions.
ASJC Scopus subject areas
- Physics and Astronomy (miscellaneous)