On the Josephson Coupling between a disk of one superconductor and a surrounding superconducting film of a different symmetry
Abstract
A cylindrical Josephson junction with a spatially dependent Josephson coupling which averages to zero is studied in order to model the physics of a disk of d-wave superconductor embedded in a superconducting film of a different symmetry. It is found that the system always introduces Josepshon vortices in order to gain energy at the junction. The critical current is calculated. It is argued that a recent experiment claimed to provide evidence for s-wave superconductivity in YBa2Cu3O7 may also be consistent with d-wave superconductivity. Figures available from the author on request.
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