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首页> 外文期刊>Physica, C. Superconductivity and its applications >Electromagnetic coupling in small grain YBa2Cu3O7-delta superconducting ceramics: full and hollow cylinders
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Electromagnetic coupling in small grain YBa2Cu3O7-delta superconducting ceramics: full and hollow cylinders

机译：小晶粒YBa2Cu3O7-δ超导陶瓷中的电磁耦合：实心和空心圆柱体

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摘要

This paper describes a method to assess the electromagnetic characteristics of a superconducting ceramic material. YBa2Cu3O7-delta ceramic samples have been made in the form of hollow cylinders with the standard 4 terminal configuration for measurement of the critical current (I-c) attached to the outer surface. An additional wire carries a second internal current (I-int) along the central axis. I-c can thus be modulated by I-int. In particular, an increase in I-c can be achieved by directing I-int in the opposite direction to the cylinder current in order to compensate the self-generated magnetic field. The I-c-I-int characteristic can be described by a critical state model where we assume a linear dependence between the local critical current density (j(c)) and the local magnetic field (H) for the superconducting polycrystalline material. Based on this linear model the experimental data for a given sample can be analysed to extract two parameters: the maximum local critical current density (j(0)) and the local magnetic field (H-0) for which j(c) should vanish. The best sample yielded j(0) = 1023 A cm(-2) and H-0 = 4450 A m(-1). (C) 2001 Elsevier Science B.V. All rights reserved. [References: 11]
机译：本文介绍了一种评估超导陶瓷材料电磁特性的方法。 YBa2Cu3O7-delta陶瓷样品已制成具有标准4端子配置的空心圆柱体形式，用于测量连接到外表面的临界电流（I-c）。另一根导线沿中心轴承载第二内部电流（I-int）。因此，可以通过I-int调制I-c。尤其是，可以通过将I-int指向与圆柱电流相反的方向来实现I-c的增加，以补偿自生磁场。 I-c-I-int特性可以由临界状态模型描述，其中我们假设超导多晶材料的局部临界电流密度（j（c））和局部磁场（H）之间存在线性关系。基于此线性模型，可以分析给定样本的实验数据以提取两个参数：最大局部临界电流密度（j（0））和j（c）消失的局部磁场（H-0） 。最好的样品产生j（0）= 1023 A cm（-2）和H-0 = 4450 A m（-1）。 （C）2001 Elsevier Science B.V.保留所有权利。 [参考：11]

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