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Transition of vortex pinning behaviour induced by an artificial microstructure design in Ba(Fe0.94Co0.06)2As2 pnictide superconductor
Materials Today Physics ( IF 11.5 ) Pub Date : 2022-07-13 , DOI: 10.1016/j.mtphys.2022.100783
M.H. Tang, C.H. Dong, Z.T. Xu, C. Liu, P. Yang, C. Tu, W.W. Guo, Y.C. Zhu, C. Yao, H. Huang, D.L. Wang, X.P. Zhang, Y.W. Ma

Among various systems of iron-based superconductors, the doped Ba122 polycrystals have shown the largest application value because of their brilliant properties and chemical stability. Since there have been few reports on the vortex dynamics in Ba122 polycrystal, we firstly conduct a comparative investigation on the differences of vortex dynamics in Ba(Fe0.94Co0.06)2As2 single crystal, grain oriented polycrystal and random oriented powder in this paper. Herein, the polycrystal, which has c-axis grain texture, is prepared by the compaction of designed single crystal powder. The second magnetization peak (SMP) effects are observed in the hysteresis loops of single crystal and totally disappear in those of polycrystal and powder. Conventional magnetization relaxation and Maley's method are applied to analyse the vortex dynamics. In single crystal, the SMP effect is primarily related to the crossover of elastic-plastic vortex creep. The weak pinning in single vortex regime results in large magnetization relaxation rates (S) in low magnetic field regime. In polycrystal for H//AD (axial direction), the introduction of strong pins is effective to single vortex pinning, which brings about much lower S values in low magnetic field regime. Furthermore, the results of single crystal for H//ab, polycrystal for H//RD (radial direction) and random oriented powder are analyzed. Synergistic effects of strong pins and microscopic anisotropy on the vortex dynamics are discussed. These results will provide new knowledge for the design of high-performance Ba122 superconductors.



中文翻译:

Ba(Fe0.94Co0.06)2As2 pnictide超导体中人工微结构设计引起的涡旋钉扎行为的转变

在各种铁基超导体体系中,掺杂的Ba122多晶因其优异的性能和化学稳定性而显示出最大的应用价值。由于Ba122多晶中涡动力学的报道较少,我们首先对Ba(Fe 0 . 94 Co 0.06 ) 2 As 2中涡动力学的差异进行了对比研究。本文主要介绍单晶、晶粒取向多晶和无规取向粉末。在此,具有c轴晶粒结构的多晶是通过压制设计的单晶粉末而制备的。第二磁化峰(SMP)效应在单晶的磁滞回线中观察到,而在多晶和粉末的磁滞回线中完全消失。应用常规磁化弛豫和Maley方法分析涡旋动力学。在单晶中,SMP效应主要与弹塑性涡蠕变的交叉有关。单涡流状态下的弱钉扎导致低磁场状态下的磁化弛豫率 ( S ) 大。在多晶中用于H//AD(轴向),强销的引入对单涡旋钉扎有效,这在低磁场状态下带来了更低的S值。此外,分析了H //ab单晶、H //RD(径向)多晶​​和随机取向粉末的结果。讨论了强针和微观各向异性对涡流动力学的协同作用。这些结果将为高性能 Ba122 超导体的设计提供新的知识。

更新日期:2022-07-13
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