Characteristics of nb-based josephson junctions at a temperature below 1 k1

K. Ishibashi, K. Takeno, Y. Oae, T. Sakae, Y. Matsumoto, A. Katase, S. Takada, H. Akoh, H. Nakagawa

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)


In nuclear radiation detection, superconductors have the inherent advantage of better energy resolution than that of semiconductors. The ultimate energy resolution has never been accomplished by the conventional method of fabricating the tunnel junctions. In this study, lithographic technique for Josephson LSI circuits is applied to the production of a superconducting tunnel junction for radiation detection. Nb-Al/aluminum oxide/Nb tunnel junctions with different junction sizes and barrier oxidation times have been fabricated to study their characteristics. The current-voltage curves were measured in the temperature range from 4.2 to 0.45 K. The junctions showed some amount of leakage current which remained below 2 K. The behavior of the leakage current was successfully understood from its experimental dependence on the junction size.

Original languageEnglish
Pages (from-to)1354-1357
Number of pages4
JournalIEEE Transactions on Magnetics
Issue number2
Publication statusPublished - Mar 1989

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering


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