Ac Josephson effect in superconducting all-Nb thin-film nanobridges up to 693 GHz

Yoshinori Uzawa, Etsuo Kawate, Nobumitsu Hirose, Isao Motohashi, Yuichi Harada, Matsuo Sekine, Yukinobu Miki, Masahiro Okaji

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Abstract

All-niobium thin-film nanobridges were fabricated with bridge sizes of 40-nm length, 50-nm width, and 100-nm thickness. We investigated the performance of the nanobridges by monitoring Shapiro steps induced on the current-voltage curves by an optically pumped far-infrared laser. These steps have been observed up to 693 GHz (433 μm). This is a twofold increase over that previously reported on thin-film nanobridges.

Original languageEnglish
Pages (from-to)967-969
Number of pages3
JournalApplied Physics Letters
Volume61
Issue number8
DOIs
Publication statusPublished - Dec 1 1992
Externally publishedYes

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All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

Cite this

Uzawa, Y., Kawate, E., Hirose, N., Motohashi, I., Harada, Y., Sekine, M., ... Okaji, M. (1992). Ac Josephson effect in superconducting all-Nb thin-film nanobridges up to 693 GHz. Applied Physics Letters, 61(8), 967-969. https://doi.org/10.1063/1.108472