C-axis josephson tunneling between YBa2Cu3O7 − δ and Pb: Direct evidence for mixed order parameter symmetry in a high- Tc superconductor
Date
1997Author
Kouznetsov, K. A.Sun, A. G.
Chen, B.
Katz, A. S.
Bahcall, S. R.
Clarke, J.
Dynes, R. C.
Gajewski, D. A.
Han, S. H.
Maple, M. B.

Kim, J.-T.
Ginsberg, T. M.
Source
Physical Review LettersVolume
79Pages
3050-3053Google Scholar check
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Show full item recordAbstract
C-axis Josephson tunneling experiments in which a conventional superconductor (Pb) is deposited across a single twin boundary of a YBa2Cu3O7 − δ (YBCO) crystal. We measure the critical current as a function of the magnitude and angle of a magnetic field applied in the plane of the junction. In all samples, we observe a clear experimental signature of an order parameter phase shift across the twin boundary. These results provide strong evidence for mixed d- and s-wave pairing in YBCO, with a reversal in the sign of the s-wave wave component across the twin boundary. © 1997 American Physical Society.