Superconducting vortex with extended core
Herman J. Fink
DOI 10.1103/PhysRevB.45.4799 · Physical Review B
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Abstract
A bridge-type superconducting microcircuit in a magnetic field was analyzed using the nonlinear Ginzburg-Landau theory. There exist two different spatial configurations of the order parameter; one has a maximum in the central branch and minima in the current-carrying branches, while the other is a vortex with zero order parameter over part of the central branch. For higher temperatures, near the second-order phase-transition boundary, the vortex has a point singularity, while at lower temperatures it has an extended core, a notable feature in superconductivity. The phase transition between the two vortex states is first order.
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