Coherent phase locking of high-Tc YBa2Cu3Oy Josephson junctions

H. C. Yang, C. H. Wu, M. J. Chen, J. H. Chen, C. H. Chen, H. W. Yu, J. T. Jeng, H. E. Horng

    Research output: Contribution to journalConference articlepeer-review

    4 Citations (Scopus)


    We measured I-V curves and noise characteristics of high-Tc YBa2Cu3Oy step-edge Josephson junctions and serial junction arrays under microwave irradiation. The junctions were fabricated on step-edge MgO(100) substrates with low step angles (∼30°). The junction array shows the resistively shunted junction (RSJ) behavior for at least 50 junctions and reveals a coherent phase locking under microwave irradiation. The variation of Ic was 16% for a 150-junctions array distributed along the step-edge line of 1.5 mm in width. The voltage noise, Sv, of the serial junction array scales as the number of junctions, N. The value of SIR, (SIR = |(δIc/Ic)∥(δR/R)|), for a single and 50-junctions obtained from the fluctuation measurement is consistent with the result derived from IcRn ∝ (Jc)q, with q = 0.5.

    Original languageEnglish
    Pages (from-to)308-311
    Number of pages4
    JournalIEEE Transactions on Applied Superconductivity
    Issue number1 I
    Publication statusPublished - 2001 Mar 1
    Event2000 Applied Superconductivity Conference - Virginia Beach, VA, United States
    Duration: 2000 Sep 172000 Sep 22


    • Array
    • Junction
    • Noise
    • SQUID

    ASJC Scopus subject areas

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


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