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Matrix chemical ratio and its optimization for highest flux pinning in ternary (Nd-Eu-Gd)Ba_2Cu_3O_y

机译:三元(Nd-Eu-Gd)Ba_2Cu_3O_y中基体化学比及其最高通量钉扎的优化

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摘要

We have fabricated the ternary (Nd, Eu, Gd)Ba_2Cu_3O_y system with various Nd:Eu:Gd ratios with the aim of optimizing the pinning performance at 77 K. The magnetization measurements suggest that the three elements (Nd, Eu, Gd) contribute to pinning in different manners: Nd mainly enhances flux pinning at low magnetic fields, Eu controls the second peak position and the irreversibility field, while Gd slightly enhances intermediate and high-field J_c values. The scaling analysis of the pinning force density versus the reduced field h = H_a/H_(irr) showed a peak at h = 0.55. This value is higher than the theoretically predicted highest value of h = 0.5, corresponding to triangle open T_c pinning. We proved that an excellent flux pinning can be achieved in the entire magnetic field range when sub-micron secondary phase particles are dispersed in the NEG-123 matrix with an optimum Nd:Eu:Gd ratio.
机译:我们制造了具有不同Nd:Eu:Gd比的三元(Nd,Eu,Gd)Ba_2Cu_3O_y系统,目的是优化77 K时的钉扎性能。磁化测量表明,三个元素(Nd,Eu,Gd)有助于以不同的方式钉扎:Nd主要增强低磁场下的磁通钉扎,Eu控制第二个峰值位置和不可逆磁场,而Gd则稍微增加中磁场和高磁场J_c值。钉扎力密度与减小的磁场的比例分析h = H_a / H_(irr)在h = 0.55处显示一个峰值。该值高于h = 0.5的理论预测最大值,对应于三角形开路T_c钉扎。我们证明,当亚微米次级相颗粒以最佳Nd:Eu:Gd比分散在NEG-123基质中时,可以在整个磁场范围内实现出色的磁通钉扎。

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