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首页> 外文期刊>Physica, C. Superconductivity and its applications >Refinement of secondary phase particles for high critical current densities in (Nd,Eu,Gd)-Ba-Cu-O superconductors
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Refinement of secondary phase particles for high critical current densities in (Nd,Eu,Gd)-Ba-Cu-O superconductors

机译：（Nd，Eu，Gd）-Ba-Cu-O超导体中高临界电流密度的次级相粒子的细化

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摘要

We have prepared (Nd sub(0.33)Eu sub(0.33)Gd sub(0.33))Ba sub(2)Cu sub(3)O sub(y) (`NEG') superconductors by means of melt-processing under a partial oxygen pressure of 0.1%. In these samples, we achieved a large critical current density, J sub(c), of 6.8x10 super(4) A/cm super(2) at T identical with 77 K and in an applied magnetic field, H sub(a) identical with 2.5 T. Furthermore, the irreversibility field, H sub(irr), exceeds 7 T at 77 K for fields applied parallel to the c-axis of the sample. As additional pinning sites, we introduced up to 40 mol% (Nd,Eu,Gd) sub(2)BaCuO sub(5) (NEG-211) particles plus Pt in analogy to YBa sub(2)Cu sub(3)O sub(y) (YBCO) melt-processed superconductors. Microstructural observations clarified that the Pt addition was effective in reducing the size of NEG-211 second-phase particles, which led to a dramatic increase in J sub(c) as compared to melt-processed YBa sub(2)Cu sub(3)O sub(y) and NdBa sub(2)Cu sub(3)O sub(y) (NdBCO). A pronounced secondary peak effect was observed in all magnetization curves obtained at 77 K, however, there is a considerable change in the shape of the magnetization loops as a function of NEG-211 content, which demonstrates the pinning provided by the NEG-211 particles in addition to the delta T sub(c)-pinning caused by fluctuation in the transition temperature, T sub(c), like in ordinary NdBa sub(2)Cu sub(3)O sub(y) superconductors.
机译：我们通过在部分条件下进行熔融加工的方法制备了（Nd sub（0.33）Eu sub（0.33）Gd sub（0.33））Ba sub（2）Cu sub（3）O sub（y）（'NEG'）超导体氧气压力为0.1％。在这些样本中，我们在等于77 K的T和施加的磁场H sub（a）下实现了6.8x10 super（4）A / cm super（2）的大临界电流密度J sub（c）。等于2.5T。此外，对于平行于样品c轴施加的场，不可逆场H sub（irr）在77 K时超过7T。作为额外的钉扎位点，我们类似于YBa sub（2）Cu sub（3）O引入了高达40 mol％（Nd，Eu，Gd）sub（2）BaCuO sub（5）（NEG-211）颗粒和Pt （y）（YBCO）熔融加工超导体。微观结构观察表明，添加Pt可以有效减小NEG-211第二相颗粒的尺寸，与熔融处理的YBa sub（2）Cu sub（3）相比，J sub（c）显着增加。 O sub（y）和NdBa sub（2）Cu sub（3）O sub（y）（NdBCO）。在77 K下获得的所有磁化曲线中均观察到明显的次级峰效应，但是，磁化回路的形状随NEG-211含量的变化而发生了很大变化，这表明NEG-211颗粒提供了钉扎作用除了由转变温度波动引起的ΔT sub（c）钉扎之外，T sub（c）像普通的NdBa sub（2）Cu sub（3）O sub（y）超导体一样。

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