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arXiv 0912.1979cond-mat.supr-con
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超导薄膜中幂律J_c(B)到零场的数值推广

Numerical extension of the power law Jc(B) to zero field in thin superconducting films

F. Hengstberger, M. Eisterer, H. W. Weber

摘要:

在给定的材料定律Jc(B)下,考虑样品的自场,对超导薄膜中的电流和场分布进行了数值模拟,并将其作为外加场H的函数。临界电流密度对外加场Jc(H)的依赖关系计算与实验进行比较,考虑到运输测量的几何形状。我们表明,外推的高场功率定律Jc \propto B^{-α}的最低领域的结果在零施加场Jc(H=0)的一个有限的临界电流,尽管奇异性的Jc(B)。此外,实验的特殊功能,如在Jc(H)的低场高原,被复制,并发现是由自场。

英文摘要:

Numerical simulations of the current and field distribution in thin superconducting films are carried out for a given material law Jc(B) and as a function of the applied field H, taking the sample's self-field into account. The dependence of the critical current density on the applied field Jc(H) is computed for comparison with experiment, considering the geometry of transport measurements. We show that extrapolating the high field power law Jc \propto B^{-α} to the lowest fields results in a finite critical current at zero applied field Jc(H=0), despite the singularity of Jc(B). Moreover, particular features of the experiment, such as a low field plateau in Jc(H), are reproduced and found to be determined by the self-field.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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