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Investigation of the magnetic field dependence of the maximum zero-voltage current of wide, high-current Josephson junctions has revealed behavior drastically different from the usual Fraunhofer pattern for narrow junctions. The experiments are interpreted as evidence for a Meissner effect for the insulating layer and adjacent penetration layers of wide junctions in low external fields, and for an eventual transition to a mixed state as the external field is increased from zero.
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Goldman et al. (1967) studied this question.
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