{ital c} -axis Josephson Tunneling between YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta} } and Pb: Direct Evidence for Mixed Order Parameter Symmetry in a High-{ital T}{sub {ital c}} Superconductor

Journal Article · Wed Oct 01 00:00:00 EDT 1997 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.79.3050· OSTI ID:543849

Kouznetsov, K A; Kouznetsov, K A; Chen, B; Chen, B; Bahcall, S R; Bahcall, S R; Clarke, J; Clarke, J ^[1]; Sun, A G; Katz, A S; Dynes, R C; Gajewski, D A; Han, S H; Maple, M B ^[2]; Giapintzakis, J; Kim, J; Ginsberg, D M ^[3]

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1. Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720 (United States)
2. Department of Physics, University of California, San Diego, La Jolla, California 92093 (United States)
3. Department of Physics, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801; Department of Physics, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801 (United States)

We report a new class of c -axis Josephson tunneling experiments in which a conventional superconductor (Pb) is deposited across a single twin boundary of a YBa{sub 2}Cu {sub 3}O{sub 7 {minus}{delta}} (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 component across the twin boundary. {copyright} {ital 1997} {ital The American Physical Society}

• Research Organization: Lawrence Berkeley National Laboratory
• DOE Contract Number: AC03-76SF00098; FG03-86ER45230
• OSTI ID: 543849
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 16 Vol. 79; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
66 PHYSICS
BARIUM OXIDES
COPPER OXIDES
D WAVES
HIGH-TC SUPERCONDUCTORS
JOSEPHSON EFFECT
LEAD
MAGNETIC FIELDS
ORDER PARAMETERS
S WAVES
TWINNING
YTTRIUM OXIDES