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.
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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.