Critical current density determination of superconducting material

B. Douine, K. Berger, J. Lévêque
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Abstract

Knowledge of the law critical current density versus magnetic field, JC(B), of a superconducting material is very important to users. In this article are presented two methods of characterization to obtain experimentally the law JC (B). These two methods are commonly used for applications in electrical engineering. The electrical method is based on measuring the voltage and current of a superconducting sample. It has the advantage of simplicity in implementation, but the main drawback as the presence of the self magnetic field. This prevents the determination of the parameters of JC(B) for weak magnetic fields. The magnetic method using the cycle of magnetization has the advantage of making measurements without contact with the sample but has two drawbacks: it is based on a theoretical model in which JC is constant and the assumption of infinite length sample.
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超导材料临界电流密度的测定
了解超导材料的临界电流密度与磁场的关系,JC(B)对用户来说是非常重要的。本文提出了两种表征方法,以实验获得定律JC (B),这两种方法通常用于电气工程应用。电学方法是基于测量超导样品的电压和电流。它具有实现简单的优点,但主要缺点是存在自磁场。这妨碍了弱磁场下JC(B)参数的测定。利用循环磁化法进行测量的优点是不需要与样品接触,但也有两个缺点:它建立在JC为常数的理论模型和样品无限长假设的基础上。
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