Josephson current in an anisotropic d-wave model

C. O’Donovan; D. Branch; J. P. Carbotte; J. S. Preston

doi:10.1103/PhysRevB.51.6588

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Josephson current in an anisotropic d-wave model

C. O’Donovan, D. Branch, J. P. Carbotte, J. S. Preston

DOI 10.1103/PhysRevB.51.6588 · Physical Review B

T1

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Abstract

There should be no Josephson current between a CuO2 plane with a gap of dx2-y2 symmetry and a conventional s-wave superconductor. Nevertheless such a current is observed to exist between YBa2Cu3O7 (YBCO) and Pb although with a reduced magnitude. Penetration depth measurements have revealed a large anisotropy between a and 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 dx2-y2 symmetry but with a minor extended s-wave component. The resultant Josephson current for YBCO-Pb junctions is in good agreement with experiment.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
YBa2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
Pb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
YBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown