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Controlling soft vortex matter: Edge effects on vortex configurations and partial vortices in a superconducting Type-II/Type-I bilayer
Journal of Physics: Condensed Matter ( IF 2.3 ) Pub Date : 2020-03-10 , DOI: 10.1088/1361-648x/abd118
W Y Córdoba-Camacho 1 , R M da Silva 1 , J Barba-Ortega 2 , J Albino Aguiar 1
Affiliation  

We demonstrate that the presence of edges in a superconducting film made of a Type-I/Type-II bilayer stabilizes Type-II/Type-I hybrid ({\it inter-type}) flux patterns, as vortex clusters, chains, and gel phase. These patterns are very sensitive to primary parameters such as applied magnetic field, layer coupling, and temperature. Thus, the magnetization versus temperature curves, $M(T)$, for many values of coupling were used to estimate the strength of the layer couplings, and also as a guide for obtaining sequentially the flux patterns. We also show that the effect of the borders on the unrestricted states is to shift them to states of higher density, since they introduce extra compression on the vortex matter. For a low layer coupling regime, we observe an unusual magnetic response where few partial vortices (partial in a sense they miss the contribution of the Type I part), repelling each other and bounded to the surfaces, populate one layer leaving the other empty. We expect that the predicted flux configurations can stimulate experimentalists in trying to observe them by direct imaging techniques.

中文翻译:

控制软涡旋物质:超导 II 型/I 型双层中涡流构型和部分涡旋的边缘效应

我们证明了由 I 型/II 型双层制成的超导薄膜中边缘的存在稳定了 II 型/I 型混合({\it inter-type})通量模式,如涡旋簇、链和凝胶相。这些图案对主要参数非常敏感,例如外加磁场、层耦合和温度。因此,许多耦合值的磁化强度与温度曲线 $M(T)$ 被用于估计层耦合的强度,并且还用作顺序获得通量模式的指南。我们还表明,边界对无限制状态的影响是将它们转移到更高密度的状态,因为它们会在涡旋物质上引入额外的压缩。对于低层耦合机制,我们观察到一种不寻常的磁响应,其中很少有部分涡流(从某种意义上说,它们错过了 I 型部分的贡献),相互排斥并限制在表面上,填充一层而另一层为空。我们期望预测的通量配置可以刺激实验者尝试通过直接成像技术观察它们。
更新日期:2020-03-10
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