Superconducting pairing symmetry in YBa2Cu3O7-x from a study of josephson tunnel junctions

H. E. Horng, L. M. Wang, S. Y. Yang, J. T. Jeng, H. C. Yang

    Research output: Contribution to journalArticle

    Abstract

    The biepitaxial YBa2Cu3O7-x(YBCO)/CeO2/MgO Josephson junctions and c-axis YBCO/Au/Pb junctions have been fabricated to investigate the pairing state in YBCO. As a result, for the in-plane biepitaxial YBCO grain boundary junctions, both the integral and half-integral Shapiro steps are observed under zero applied magnetic field, suggesting the possibility of d-wave pairing in YBCO. On the other hand, Josephson tunneling currents have been observed on the YBCO/Au/Pb junctions with tunneling along the c axis of the YBCO films. The dependence of the Josephson critical current on the applied field for the YBCO/Au/Pb junctions exhibits an unconventional diffraction pattern which is close to the characteristic of a predominantly d-wave superconductor. The results are discussed in terms of the existing s-wave and d-wave symmetry theories.

    Original languageEnglish
    Pages (from-to)262-267
    Number of pages6
    JournalChinese Journal of Physics
    Volume38
    Issue number2-2
    Publication statusPublished - 2000

    ASJC Scopus subject areas

    • Physics and Astronomy(all)

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