六角图形阵列和缺陷几何形状对超导薄膜临界电流的影响
Effect of hexagonal patterned arrays and defect geometry on the critical current of superconducting films
摘要：
理解钉扎对超导体中涡旋动力学的影响是控制临界电流值的关键因素。大规模的涡动力学模拟可以提供一个合理的方法来实现这一目标。在这里，我们使用含时的金-朗道方程来研究人工制造的钉扎中心周期性地排列在六角晶格中的超导薄膜。我们计算的临界电流密度为各种几何形状的钉扎中心-改变它们的大小，强度和密度。此外，我们揭示了图案失真的磁场依赖的临界电流的影响。我们比较我们的结果直接与现有的实验测量图案的锗-锗薄膜，获得良好的协议。我们的研究结果提供了重要的系统性的见解钉扎机制，在这些人工钉扎景观，并打开了一条路径，定制超导薄膜所需的临界电流行为。
英文摘要：
Understanding the effect of pinning on the vortex dynamics in superconductors is a key factor towards controlling critical current values. Large-scale simulations of vortex dynamics can provide a rational approach to achieve this goal. Here, we use the time-dependent Ginzburg-Landau equations to study thin superconducting films with artificially created pinning centers arranged periodically in hexagonal lattices. We calculate the critical current density for various geometries of the pinning centers --- varying their size, strength, and density. Furthermore, we shed light upon the influence of pattern distortion on the magnetic-field-dependent critical current. We compare our result directly with available experimental measurements on patterned molybdenum-germanium films, obtaining good agreement. Our results give important systematic insights into the mechanisms of pinning in these artificial pinning landscapes and open a path for tailoring superconducting films with desired critical current behavior.
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