Critical Josephson Current in a Model Pb/YBa_2Cu_3O_7 Junction

Details Critical Josephson Current in a Model Pb/YBa_2Cu_3O_7 Junction Critical Josephson Current in a Model Pb/YBa_2Cu_3O_7 Junction

1995-06-07

arxiv.org/abs/cond-mat/9506033v1

Physics

Condensed Matter

Latex File, 21 pages, 6 figures in uuencoded postscript, In Press (Phys. Rev. B)

Scientific paper

10.1103/PhysRevB.52.6894

In this article we consider a simple model for a c--axis Pb/YBa_2Cu_3O_{7-\delta} Josephson junction. The observation of a nonzero current in such a junction by Sun et al. [A. G. Sun, D. A. Gajewski, M. B. Maple, R. C. Dynes, Phys. Rev. Lett. 72, 2267 (1994)] has been taken as evidence against d--wave superconductivity in YBa_2Cu_3O_{7-\delta}. We suggest, however, that the pairing interaction in the CuO_2 planes may well be d--wave but that the CuO chains destroy the tetragonal symmetry of the system. We examine two ways in which this happens. In a simple model of an incoherent junction, the chains distort the superconducting condensate away from d_{x^2-y^2} symmetry. In a specular junction the chains destroy the tetragonal symmetry of the tunneling matrix element. In either case, the loss of tetragonal symmetry results in a finite Josephson current. Our calculated values of the critical current for specular junctions are in good agreement with the results of Sun and co-workers.

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