The behavior of a superconducting ring of homogeneous wire of transverse dimensions d{}{ξ} and {λ} and uniform cross section connected to two long leads that carry a measuring current is analyzed using the nonlinear Ginzburg-Landau equations. When a magnetic field is present the system behaves like a superconducting quantum-interference device for appropriate values of ring sizes even though it has no Josephson junctions. A practical realization of such a device is within current technical capabilities.
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Fink et al. (1987) studied this question.
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