Modified superconductor-insulator-normal metal-insulator- superconductor Josephson junctions with high critical parameters

I. P. Nevirkovets*, J. B. Ketterson, J. M. Rowell

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

Abstract

Superconductor-insulator-normal metal-insulator-superconductor (SINIS) and SINSNIS junctions (here S, I, and N denote superconductor, insulator, and normal metal, respectively) were fabricated using Nb/Al technology and characterized at low temperatures. It is shown that asymmetric SINIS junctions with different transparency of the two tunnel barriers may have higher critical voltages than analogous symmetric junctions at 4.2 K. Also, SINSNIS junctions were fabricated and investigated. If the thickness of the S layer is very thin, these junctions have quasiparticle current-voltage characteristics similar to those of conventional SINIS junctions at 4.2 K, but the Josephson critical current densities, and therefore, the critical voltages, are much higher than the corresponding values for conventional SINIS junctions.

Original languageEnglish (US)
Pages (from-to)3980-3985
Number of pages6
JournalJournal of Applied Physics
Volume89
Issue number7
DOIs
StatePublished - Apr 1 2001

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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