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首页> 外文期刊>Physica, C. Superconductivity and its applications >Magnetic field dependence of the critical current in polycrystalline YBCO bridges with decreasing width
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Magnetic field dependence of the critical current in polycrystalline YBCO bridges with decreasing width

机译：宽度减小的多晶YBCO桥中临界电流的磁场依赖性

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摘要

We have performed a theoretical approach of the magnetic field dependence of the critical current, I sub(c)(B) (B identical with 0-35 Oe), for superconducting samples with different sizes and critical current densities. In order to check our model we have adjusted a systematic experimental study made on variable width bridges (w identical with 50-2000 mu m) engraved in YBCO thick films. Regarding our bridges as sets of random linear arrays of coupled Josephson junctions, and with some microstructural knowledge, we have obtained families of curves I sub(c)(B, w) that reproduce in a semi-quantitative manner the observed experimental results. The percolative behavior and quantum interference effects between different current paths were considered to model qualitatively the experimentally observed quasi-oscillatory I sub(c)(B) dependencies. The mismatch between our model and others' similar attempts is also discussed.
机译：我们已经对临界电流I sub（c）（B）（B等于0-35 Oe）的磁场依赖性进行了理论上的处理，以用于具有不同大小和临界电流密度的超导样品。为了检验我们的模型，我们调整了对刻在YBCO厚膜上的变宽桥（w等于50-2000μm）进行的系统实验研究。关于我们的桥梁作为耦合的约瑟夫森结的随机线性阵列的集合，并具有一些微结构知识，我们获得了曲线I sub（c）（B，w）的族，它们以半定量方式再现了观察到的实验结果。考虑不同电流路径之间的渗透行为和量子干扰效应，以定性地对实验观察到的准振荡I sub（c）（B）依赖性进行建模。还讨论了我们的模型与其他人的相似尝试之间的不匹配。

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