Spontaneous Fluxoid Formation in Superconducting Loops

Details Spontaneous Fluxoid Formation in Superconducting Loops Spontaneous Fluxoid Formation in Superconducting Loops

2009-07-15

arxiv.org/abs/0907.2505v1

Physical Review B Volume: 80 Issue: 18 Article Number: 180501 NOV 2009

Physics

Condensed Matter

Superconductivity

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

Scientific paper

10.1103/PhysRevB.80.180501

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 $\tau_{Q}$, as one would expect if the transition took place as fast as causality permits. However, the observed Zurek-Kibble scaling exponent $\sigma = 0.62\pm0.15$ 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.

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