Spontaneous fluxoid formation in superconducting loops

R. Monaco, Jesper Mygind, R. Rivers, V. Koshelets

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We report on the 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 a scaling relation on the quenching time τQ, as one would expect if the transition took place as fast as causality permits. However, the observed Zurek-Kibble scaling exponent σ=0.62±0.15 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.
Original languageEnglish
JournalPhysical Review B Condensed Matter
Issue number18
Pages (from-to)180501
Publication statusPublished - 2009

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Copyright 2009 American Physical Society


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