High quality Nb/Al-AlOx/Nb superconducting tunnel junctions for radiation detection

K. Joosse, H. Nakagawa, H. Akoh, S. Takada, K. Maehata, K. Ishibashi

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Abstract

Nb/Al-AlOx/Nb tunnel junctions designed for x-ray detection have been manufactured and characterized at temperatures down to 0.35 K. At a bias voltage of 0.5 mV, a leakage current of the order of 0.1 pA/μm2, and a dynamic resistance exceeding 106 times the normal state resistance, were achieved in junctions with dimensions up to 200×200 μm2 and critical current densities of order 200 A/cm2. The combination of high critical current density, low leakage current, and large area represents an important step towards the development of superconducting tunnel junction detectors with improved spectroscopic performance.

Original languageEnglish
Pages (from-to)702-704
Number of pages3
JournalApplied Physics Letters
Volume68
Issue number5
DOIs
Publication statusPublished - Dec 1 1996

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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    Joosse, K., Nakagawa, H., Akoh, H., Takada, S., Maehata, K., & Ishibashi, K. (1996). High quality Nb/Al-AlOx/Nb superconducting tunnel junctions for radiation detection. Applied Physics Letters, 68(5), 702-704. https://doi.org/10.1063/1.116597