It has been argued by Zurek and Kibble that the likelihood of producing defects in a continuous phase transition depends in a characteristic way on the quench rate. In this paper we discuss our experiment for measuring the Zurek-Kibble (ZK) scaling exponent σ for the production of fluxons in annular symmetric Josephson tunnel junctions. The predicted exponent is σ=0.25, and we find σ=0.27±0.05. Further, there is agreement with the ZK prediction for the overall normalization.
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Monaco et al. (2003) studied this question.
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