Anisotropic current transport properties and their scaling in multifilamentry Bi-2223 Ag-sheathed tapes
Anisotropic current transport properties and their scaling in multifilamentry Bi-2223 Ag-sheathed tapes
复制标题
多丝 Bi-2223 银护套带中的各向异性电流传输特性及其缩放
DOI：
10.1109/77.919921
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发表时间：
2001
期刊：
影响因子：
--
通讯作者：
H. Okamoto
中科院分区：
文献类型：
--
作者：
T. Kiss;H. Okamoto
利用描述渗流输运特性的统计E-J模型，分析了Bi2223Ag护套带材的钉扎强度、钉扎强度分布和钉扎强度与角度的关系。结果表明，各向异性可以归因于脱钉扎跃变场的角度依赖性，并且与钉扎力密度有关的标度也成立。考虑丝束失准角的扩展Tinkham 2D模型可以精确地描述过渡场的角度依赖关系。我们得到了描述磁场和磁带的J/B、c/和n值与角度关系的解析表达式。它允许我们只使用有限的数据集，即(1)垂直场中磁场的依赖关系和(2)垂直和平行位形之间过渡场的各向异性比，来预测输运性质的角度依赖关系。
Using a statistic E-J model describing percolative current transport properties, we analyzed pinning strength, its distribution and angular dependence of Bi-2223 Ag sheathed tapes. It has been shown that the anisotropy can be attributed to angular dependence of the depinning transition field, and a scaling holds with respect to the pinning force density. The angular dependence of the transition field can be described precisely by an extended Tinkham 2D model taking into account misalignment angle of the filaments. We derive an analytical expression describing the magnetic field and angular dependence of J/sub c/ and n value of the tape. It allows us to predict the angular dependence of the transport properties using only limited data set, i.e., (1) magnetic field dependence in perpendicular field and (2) anisotropic ratio of the transition fields between perpendicular and parallel configuration.