Superconducting microcircuit and fluxoid quantization: A new quantum interferometer

H. J. Fink; J. Loo; S. M. Roberts

doi:10.1103/PhysRevB.37.5050

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Superconducting microcircuit and fluxoid quantization: A new quantum interferometer

H. J. Fink, J. Loo, S. M. Roberts

DOI 10.1103/PhysRevB.37.5050 · Physical Review B

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Abstract

Detailed solutions of the nonlinear Ginzburg-Landau equations are presented for a superconducting ring connected to two long leads. We assume a homogeneous wire of transverse dimension smaller than the coherence length ξ and penetration depth λ. This circuit behaves in much the same way as an ordinary superconducting quantum-interference device when the ring diameter is of order of magnitude of ξ(t), even though it contains no Josephson junctions. The normal-superconducting phase boundary of this device can be shifted with temperature and thus could be used to measure accurately small temperature differences. The proximity effect near a node and the equivalence of the nonlinear solutions of the above circuit with circuits of different geometries and transport or shielding currents are discussed.