Pair tunneling from {ital c}-axis YBa{sub 2} Cu{sub 3}O{sub 7{minus}{ital x}} to Pb: Evidence for {ital s}-wave component from microwave induced steps

Journal Article · Fri Mar 01 04:00:00 EST 1996 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.76.2161· OSTI ID:284444

Kleiner, R; Katz, A S; Sun, A G; Summer, R; Gajewski, D A; Han, S H; Woods, S I; Dantsker, E; Chen, B; Char, K; Maple, M B; Dynes, R C; Clarke, J ^[1]

---

1. Department of Physics, University of California, Berkeley, CA 94720 (United States)

In heavily twinned crystals or films YBa{sub 2}Cu{sub 3}O{sub 7{minus}{ital x}} (YBCO), {ital d}{sub {ital x}{sup 2}{minus}{ital y}{sup 2}} pairing symmetry is expected to cause the cancellation of first-order Josephson tunneling through a YBCO-Pb tunnel junction grown in an {ital a}-{ital b} face; any residual tunneling is thus second order. As a result, microwaves at frequency {ital f} are predicted to induce steps on the current-voltage characteristic at voltages that are multiples of 1/2({ital hf}/2{ital e}). Experimentally, steps are observed only at multiples of {ital hf}/2{ital e}, suggesting that {ital s}-wave pairing is present in YBCO; however, the simultaneous presence of {ital d}-wave pairing is by no means ruled out. {copyright} {ital 1996 The American Physical Society.}

• Research Organization: Lawrence Berkeley National Laboratory
• DOE Contract Number: AC03-76SF00098
• OSTI ID: 284444
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 12 Vol. 76; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BARIUM OXIDES
COPPER OXIDES
HIGH-TC SUPERCONDUCTORS
IV CHARACTERISTIC
JOSEPHSON EFFECT
LEAD
ORDER PARAMETERS
PAIRING INTERACTIONS
SUPERCONDUCTING JUNCTIONS
SYMMETRY
TUNNELING
YTTRIUM OXIDES