Current transfer lengths in multifilamentary superconductors with composite sheath materials
Current transfer lengths in multifilamentary superconductors with composite sheath materials
复制标题
复合护套材料多丝超导体中的电流传输长度
DOI：
10.1109/77.783488
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发表时间：
1999
影响因子：
1.8
通讯作者：
R. Flukiger
中科院分区：
文献类型：
--
作者：
M. Dhallé;L. Porcar;M. Ivancevic;A. Polcari;Y.B. Huang;G. Witz;R. Flukiger
我们描述了金属基体和超导细丝之间通过高阻层的电流传输过程，使用一个简单的模型来分析复合超导体的基本材料参数的电流-电压数据。多层高温超导导体几乎总是由嵌入在均匀金属基体中的陶瓷丝组成。这已经改变了引入高阻阻挡层，旨在减少灯丝耦合交变场条件下。虽然这些层确实对导体的AC损耗特性具有显著影响，但它们也倾向于使问题复杂化，例如端子处的电流注入和局部灯丝缺陷周围的电流“愈合”。为了更好地理解这些过程，我们使用一个简单的和定量的模型，它涉及的障碍和矩阵电阻率直接的特征电流传输长度。这种关系可以用来获得直接的实验访问的电势垒特性。我们说明了它的有用性与复合护套Bi（2223）磁带上获得的典型数据。
We describe current transfer processes between a metallic matrix and superconducting filaments through high-resistance layers, using a simple model to analyze current-voltage data of composite superconductors in terms of basic material parameters. Multifilamentary high Tc conductors nearly always consisted of ceramic filaments embedded in a uniform metallic matrix. This has changed with the introduction of highly resistive barrier layers, aimed at reducing filament coupling under alternating-field conditions. While such layers indeed have significant effects on the AC loss properties of the conductor, they also tend to complicate issues such as current injection at terminals and current 'healing' around local filament defects. In order to gain a better understanding of these processes, we use a simple and quantitative model which relates the barrier and matrix resistivity directly to a characteristic current transfer length. This relation can be used to gain direct experimental access to the electrical barrier properties. We illustrate its usefulness with typical data obtained on composite-sheathed Bi(2223) tapes.