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arXiv 2201.11688cond-mat.supr-con
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不同性质钉扎中心对周围涡的影响

Influence of pinning centers of different natures onsurrounding vortices

Rodolfo Carvalho dos Santos, Elwis Carlos Sartorelli Duarte, Danilo Okimoto, Alice Presotto, Edson Sardella, Maycon Motta, Rafael Zadorosny

摘要:

研究涡旋动力学及其与钉扎中心的相互作用是获得超导材料中更高临界电流的重要组成部分。在盲孔和通孔等工程缺陷阵列周围的涡流分布可能有助于提高超导性能。因此,在这项工作中,我们使用含时的金-朗道理论来研究具有三种不同配置的大中心正方形缺陷的介观尺寸超导体中的涡旋动力学:(i)穿过样品的孔(与真空的界面);(ii)具有较低临界温度(Tc)的超导区域;以及(iii)具有更强超导性的区域,即,具有更高的Tc。这样的系统可以被设想为宏观装饰样本的基本构建块。因此,我们评估了不同的界面上的涡旋动力学的影响,以及它们的影响,在磁场依赖的磁化强度和时间依赖的感应电势变化。结果表明,下临界场与缺陷的性质无关。然而,电流拥挤在通孔的顶点处,产生局部超导性的较低退化,这可能增加上临界场。另一方面,最后一种类型的缺陷可以用于更精确地控制缺陷周围的主要超导区域中的涡旋动力学。而前两种缺陷是吸引的涡旋,第三种类型是排斥他们,需要几个涡旋渗透在超导矩阵有涡旋渗透到它。

英文摘要:

Studies involving vortex dynamics and their interaction with pinning centers are an important ingredient to reach higher critical currents in superconducting materials. The vortex distribution around arrays of engineered defects, such as blind and through holes, may help to improve the superconducting properties. Thus, in this work, we used the time-dependent Ginzburg-Landau theory to investigate the vortex dynamics in superconductors of mesoscopic dimensions with a large central square defect with three different configurations: (i) a hole which passes through the sample (interface with the vacuum); (ii) a superconducting region with lower critical temperature (Tc); and (iii) a region with a more robust superconductivity, i.e., with a higherTc. Such systems can be envisaged as elementary building blocks of a macroscopic decorated specimen. Therefore, we evaluated the influence of different interfaces on the vortex dynamics and their effects in the field-dependent magnetization and time-dependent induced electric potential variation. The results show that the lower critical field is independent from the nature of the defect. However, the currents crowd at the vertices of the through hole producing a lower degradation of the local superconductivity, which may increase the upper critical field. On the other hand, the last type of defect can be used to control the vortex dynamics in the main superconducting region around the defect with more accuracy. Whereas the first two defects are attractive for the vortices, the third type is repulsive for them, being needed several vortices penetrated in the superconducting matrix to have vortices penetrated into it.

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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