• DocumentCode
    1237700
  • Title

    Investigation of properties of stacked-type interface-treated Josephson junctions fabricated with PrGaO3 doping process

  • Author

    Yoshinaga, Y. ; Izawa, S. ; Wakita, K. ; Kito, T. ; Inoue, M. ; Fujimaki, A. ; Hayakawa, H.

  • Author_Institution
    Dept. of Quantum Eng., Nagoya Univ., Japan
  • Volume
    13
  • Issue
    2
  • fYear
    2003
  • fDate
    6/1/2003 12:00:00 AM
  • Firstpage
    805
  • Lastpage
    808
  • Abstract
    We have investigated how surface morphology of base YBa2Cu3O7-δ (YBCO) films affects the properties of the stacked-type interface-treated junctions (ITJ) with the PrGaO3 (PGO) doping process. In the ITJs, the junction barriers are formed by Ar ion milling and subsequent annealing, without depositing artificial barriers. The PGO doping process was carried out for eliminating excess currents of the junctions. Our results suggest that the YBCO films suitable for the junctions should consist of similar size grains, and do not contain any precipitates. Furthermore, the morphology should not be changed after the Ar ion milling. The nine junctions fabricated on such a film exhibit the averaged critical current density (Jc) on the chip of 9.0×103 A/cm2, the small 1σ spread of 5.6% in the Jc, and the averaged IcRn product on the chip of 1.5 mV with overdamped characteristics at 4.2 K.
  • Keywords
    Josephson effect; annealing; barium compounds; critical current density (superconductivity); grain size; high-temperature superconductors; praseodymium compounds; superconducting thin films; yttrium compounds; 4.2 K; Ar ion milling; PGO doping; YBCO film; YBa2Cu3O7:PrGaO3; annealing; critical current density; grain size; high temperature superconductor; stacked-type interface-treated Josephson junction; surface morphology; Annealing; Argon; Critical current density; Doping; High temperature superconductors; Josephson junctions; Milling; Superconducting integrated circuits; Surface morphology; Yttrium barium copper oxide;
  • fLanguage
    English
  • Journal_Title
    Applied Superconductivity, IEEE Transactions on
  • Publisher
    ieee
  • ISSN
    1051-8223
  • Type

    jour

  • DOI
    10.1109/TASC.2003.814049
  • Filename
    1211726
    • Link To Document
    https://search.isc.ac/dl/search/defaultta.aspx?DTC=49&DC=1237700