• DocumentCode
    791375
  • Title

    Measurement of the coherence length of sputtered Nb0.62Ti0.38N thin films

  • Author

    Yu, Lei ; Newman, Nathan ; Rowell, John M.

  • Author_Institution
    Dept. of Electr. Eng., Arizona State Univ., Tempe, AZ, USA
  • Volume
    12
  • Issue
    2
  • fYear
    2002
  • fDate
    6/1/2002 12:00:00 AM
  • Firstpage
    1795
  • Lastpage
    1798
  • Abstract
    Superconducting and normal state properties of the useful film material NbxTi1-xN have been characterized. In particular, the coherence length of reactively sputtered Nb0.62Ti0.38N thin films is determined to be 2.4±0.3 nm. The results are inferred from fitting the de Gennes-Werthamer theory to experimental measurements of the proximity-induced depression of the transition temperature in Nb-Nb0.62Ti0.38N-Nb structures. The coherence length, as defined by this theory, can be used to infer the zero-temperature Ginzburg-Landau coherence length, ξGL (0), of 3.8 nm for the Nb0.62Ti0.38N synthesized in this study. The shorter coherence length and lower resistivity of these films, when compared to NbN, indicates that they are an appealing choice for electrodes in rapid single flux quantum circuits.
  • Keywords
    coherence length; niobium compounds; proximity effect (superconductivity); sputtered coatings; superconducting logic circuits; superconducting thin films; superconductor-normal-superconductor devices; titanium compounds; type II superconductors; Nb0.62Ti0.38N; coherence length; de Gennes-Werthamer theory; digital logic circuits; energy gap; lattice-matched substrates; normal state properties; pentalayer SNS structures; proximity-induced depression; rapid single flux quantum circuits; sputtered thin films; superconducting properties; temperature-dependent resistivity; transition temperature; zero-temperature Ginzburg-Landau length; Circuit synthesis; Conductivity; Electrodes; Length measurement; Niobium; Sputtering; Superconducting films; Superconducting materials; Superconducting thin films; Superconducting transition temperature;
  • fLanguage
    English
  • Journal_Title
    Applied Superconductivity, IEEE Transactions on
  • Publisher
    ieee
  • ISSN
    1051-8223
  • Type

    jour

  • DOI
    10.1109/TASC.2002.1020339
  • Filename
    1020339
    • Link To Document
    https://search.isc.ac/dl/search/defaultta.aspx?DTC=49&DC=791375