Enlargement of Kinetic Inductance of NbN Superconducting Thin Films for Device Applications

Mohammad Sajjad Hossain, Keiji Yoshida, Keisuke Kudo, Keiji Enpuku, Kaoru Yamafuji

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

Experimental studies to enlarge kinetic inductance of NbN thin films using the effects of quality and thickness of the film are made by measuring Fiske current steps in the current-voltage (I-V) characteristics of NbN/Pb-In Josephson junctions. Experiments demonstrate that the specific kinetic inductance LK can be enlarged over a wide range by changing stoichiometry of the film, as well as by making the film thickness thin, and that this enlargement becomes larger by both effects when the film thickness is in an ultra thin regime. This inductance is shown to be well fitted to LK0λ2/d, where µ_0 isthevacuumpermeability, d isthethickness, and λ isthemagneticpenetrationdepthinthedirtylimit. Inthepresentexperimentweattainedtheinductanceashighas L_K=130 pHbythecombinedeffectsofimpurityandthicknessforafilmwith d=30 nm.

Original languageEnglish
Pages (from-to)1033-1038
Number of pages6
JournalJapanese Journal of Applied Physics
Volume31
Issue number4 R
DOIs
Publication statusPublished - Apr 1992

All Science Journal Classification (ASJC) codes

  • Engineering(all)
  • Physics and Astronomy(all)

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