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- W1659455511 abstract "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." @default.
- W1659455511 created "2016-06-24" @default.
- W1659455511 creator A5065110499 @default.
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- W1659455511 date "1995-09-01" @default.
- W1659455511 modified "2023-09-27" @default.
- W1659455511 title "Critical Josephson current in a model Pb/YBa2Cu3O7−δjunction" @default.
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- W1659455511 doi "https://doi.org/10.1103/physrevb.52.6894" @default.
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