Properties of large-sized nb-based superconducting tunnel junctions for x-ray detection

Kenji Ishibashi, Ken Ichi Mori, Toshimitsu Nagae, Chiken Kinoshita, Susumu Takada, Hiroshi Nakagawa, Hiroshi Akoh, Masahiro Aoyagi, Satoshi Kohjiro, Kazuhiko Takeno, Yuzuru Matsumoto, Akira Katase

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


Niobium-based superconducting tunnel junctions are expected to be applicable to high-resolution X-ray measurements. Large-sized tunnel junctions with a Nb/Al/A10x/Nb structure have been fabricated in order to study their performance in X-ray detection. The niobium layer which was sensitive to X-rays had a large size of 100/xm square x 1.2/xm thick. The junction detected 5.9 keV X-rays with an energy resolution of 1 keV. On the basis of the experimental data, the junction parameters were studied to produce a better energy resolution than that of silicon semiconductor detectors. The microstructure of the aluminum layer was observed by means of a transmission electron microscope.

Original languageEnglish
Pages (from-to)1969-1974
Number of pages6
JournalJapanese journal of applied physics
Issue number9
Publication statusPublished - Sept 1991

All Science Journal Classification (ASJC) codes

  • General Engineering
  • General Physics and Astronomy


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