Superconductor-semiconductor-superconductor junctions using NbN

T. Akazaki, H. Yamaguchi, J. Nitta, H. Takayanagi

Research output: Contribution to journalConference articlepeer-review

6 Citations (Scopus)


We report on the fabrication of the superconductor-semiconductor-superconductor (S-Sm-S) junction formed by two superconducting NbN electrodes and a two-dimensional electron gas (2DEG) in an Al0.7Ga0.3Sb/InAs heterostructure and we describe the superconducting characteristics we obtained. A critical current IC of approx. 0.9 μA at approx. 70 mK was obtained for the first time in the S-Sm-S junction using NbN. Although TC of NbN was about 12 K, IC decreased with increasing temperature and then disappeared at approx. 1.7 K. This phenomenon can be qualitatively explained by considering that the 2DEG underneath the NbN changed places with the pseudo-superconductor because of proximity-induced superconductivity.

Original languageEnglish
Pages (from-to)901-903
Number of pages3
JournalSuperconductor Science and Technology
Issue number11
Publication statusPublished - 1999 Nov 1
Externally publishedYes
EventProceedings of the 1999 International Superconductive Electronics Conference - Berkeley, CA, USA
Duration: 1999 Jun 211999 Jun 25

ASJC Scopus subject areas

  • Ceramics and Composites
  • Condensed Matter Physics
  • Metals and Alloys
  • Electrical and Electronic Engineering
  • Materials Chemistry


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