We report on the spontaneous production of fluxons in the presence of asymmetry-breaking magnetic field for annular Josephson tunnel junctions duringa thermal quench. The dependence on field intensity $B$ of the probability$\bar{f_1}$ to trap a single defect during the N-S phase transition drasticallydepends on the sample circumferences. We show that the data can be understoodin the framework of the Kibble-Zurek picture of spontaneous defect formationcontrolled by causal bounds.
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机译：我们报告了在热猝灭过程中环形约瑟夫森隧道结的不对称破坏磁场的存在下自发产生的磁通量。在N-S相变期间捕获单个缺陷的概率$ \ bar {f_1} $对场强$ B $的依赖性完全取决于样品的圆周。我们表明，可以在因果边界控制的自发缺陷形成的Kibble-Zurek图片框架内理解数据。
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