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

    Fingerprint

    tunnel junctions
    symmetry
    Josephson effect
    Josephson junctions
    critical current
    diffraction patterns
    grain boundaries
    magnetic fields

    ASJC Scopus subject areas

    • Physics and Astronomy(all)

    Cite this

    Superconducting pairing symmetry in YBa2Cu3O7-x from a study of josephson tunnel junctions. / Horng, H. E.; Wang, L. M.; Yang, S. Y.; Jeng, J. T.; Yang, H. C.

    In: Chinese Journal of Physics, Vol. 38, No. 2-2, 2000, p. 262-267.

    Research output: Contribution to journalArticle

    Horng, HE, Wang, LM, Yang, SY, Jeng, JT & Yang, HC 2000, 'Superconducting pairing symmetry in YBa2Cu3O7-x from a study of josephson tunnel junctions', Chinese Journal of Physics, vol. 38, no. 2-2, pp. 262-267.
    Horng, H. E. ; Wang, L. M. ; Yang, S. Y. ; Jeng, J. T. ; Yang, H. C. / Superconducting pairing symmetry in YBa2Cu3O7-x from a study of josephson tunnel junctions. In: Chinese Journal of Physics. 2000 ; Vol. 38, No. 2-2. pp. 262-267.
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    AU - Horng, H. E.

    AU - Wang, L. M.

    AU - Yang, S. Y.

    AU - Jeng, J. T.

    AU - Yang, H. C.

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    AB - 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.

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