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* Corresponding author 1 GREEN - Groupe de Recherche en Electrotechnique et Electronique de Nancy

Abstract : Knowledge of the law critical current density versus magnetic field, JcB, of a superconducting material is very important to users. In this article are presented two methods of characterization to obtain experimentally the law JcB. 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 JcB 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.

Keywords : characterization critical current density superconducting material

Author: Bruno Douine - Kévin Berger - Jean Lévêque -



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