paper

Spontaneous Fluxoid Formation in Superconducting Loops

arXiv:0907.2505 · doi:10.1103/PhysRevB.80.180501

Abstract

We report on the first experimental verification of the Zurek-Kibble scenario in an isolated superconducting ring over a wide parameter range. The probability of creating a single flux quantum spontaneously during the fast normal-superconducting phase transition of a wide Nb loop clearly follows an allometric dependence on the quenching time , as one would expect if the transition took place as fast as causality permits. However, the observed Zurek-Kibble scaling exponent is two times larger than anticipated for large loops. Assuming Gaussian winding number densities we show that this doubling is well-founded for small annuli.

10 pages, 2 figures, submitted to Phys. Rev. Letts

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