Characteristics of YBa2Cu3Oy step-edge Josephson junctions on MgO substrate

L. C. Ku, H. M. Cho, J. H. Lu, S. Y. Wang, W. B. Jian, H. C. Yang, H. E. Horng

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    11 Citations (Scopus)

    Abstract

    We fabricated and characterized YBa2Cu3Oy step-edge Josephson junctions and DC SQUID's on MgO (001) substrates. Sharp steps on MgO (001) were obtained by the techniques of photolithography and Ar-ion milling with step heights varying from 300 to 350 nm. The current-voltage (I-V) characteristic of the junction is consistent with the resistively shunted junction (RSJ) model. We obtained Jc=1.0×105 A/cm2 and IcRn=110 μV at 77 K. In addition to the conventional Shapiro steps resulting from the AC Josephson effect, half-integral steps were observed. The width of these half-integral steps was sensitive to the RF power and the magnetic field. DC SQUID's have been operated below 78 K and the observed voltage modulation agrees with the expected value.

    Original languageEnglish
    Pages (from-to)320-324
    Number of pages5
    JournalPhysica C: Superconductivity and its applications
    Volume229
    Issue number3-4
    DOIs
    Publication statusPublished - 1994 Aug 15

    ASJC Scopus subject areas

    • Electronic, Optical and Magnetic Materials
    • Condensed Matter Physics
    • Energy Engineering and Power Technology
    • Electrical and Electronic Engineering

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