Josephson current in an anisotropic [ital d]-wave model

Journal Article · Wed Mar 01 04:00:00 EST 1995 · Physical Review, B: Condensed Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.51.6588· OSTI ID:6583572

O'Donovan, C; Branch, D; Carbotte, J P ^[1]; Preston, J S ^[2]

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1. Physics and Astronomy, McMaster University, Hamilton, Ontario, L8S4M1 (Canada)
2. Engineering Physics, McMaster University, Hamilton, Ontario, L8S4M1 (Canada)

There should be no Josephson current between a CuO[sub 2] plane with a gap of [ital d][sub [ital x]][sup 2][minus][ital y][sup 2] symmetry and a conventional [ital s]-wave superconductor. Nevertheless such a current is observed to exist between YBa[sub 2]Cu[sub 3]O[sub 7] (YBCO) and Pb although with a reduced magnitude. Penetration depth measurements have revealed a large anisotropy between [ital a] and [ital b] directions presumably due to the existence of the CuO chains. Using a simple anisotropic tight-binding model in qualitative agreement with the measured penetration depths and a standard model for the spin susceptibility, we obtain, on solution of the BCS gap equations, a gap function with mainly [ital d][sub [ital x]][sup 2][minus][ital y][sup 2] symmetry but with a minor extended [ital s]-wave component. The resultant Josephson current for YBCO-Pb junctions is in good agreement with experiment.

• OSTI ID: 6583572
• Journal Information: Physical Review, B: Condensed Matter; (United States), Journal Name: Physical Review, B: Condensed Matter; (United States) Vol. 51:10; ISSN 0163-1829; ISSN PRBMDO
• Country of Publication: United States
• Language: English

Related Subjects

665411* -- Basic Superconductivity Studies-- (1992-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
BCS THEORY
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
CURRENTS
D WAVES
ELECTRIC CURRENTS
ELEMENTS
HIGH-TC SUPERCONDUCTORS
JOSEPHSON JUNCTIONS
JUNCTIONS
LEAD
METALS
OXIDES
OXYGEN COMPOUNDS
PARTIAL WAVES
PENETRATION DEPTH
S WAVES
SUPERCONDUCTING JUNCTIONS
SUPERCONDUCTORS
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
YTTRIUM OXIDES