Critical currents of ceramic superconductors induced by pulsed magnetic fields

H. Yasuoka, H. Mazaki, S. Tochihara, M. Kakihana, M. Yoshimura

研究成果: Article同行評審

4 引文 斯高帕斯(Scopus)

摘要

We attempted to measure the critical current density Jc of ceramic superconductors with pulsed magnetic fields. Using a pair of search coils coaxially mounted just below a ring sample, we measured induced signals that were considered to be proportional to the time derivative of the sample magnetization. Four samples were used: YBa2Cu3O y, YBa2Cu4Oy, Bi2Sr 2CaCu2Oy, and Bi1.6Pb 0.4Sr2Ca2Cu3Oy. These were all synthesized by the polymerized complex method. It was found that the induced signals from the paired search coils are typically of two types. One shows a monotonic decrease to zero as a function of time. The other has a minimum at a certain time and then approaches zero. The observed signals were simulated in the framework of the Bean model and the Kim-Anderson model for critical current density. Theoretical profiles by these two models reproduce the observed results well and suggest that the two types of induced signals are the same in appropriate limits. We discuss how to evaluate Jc from the observed signals.

原文English
頁(從 - 到)6759-6766
頁數8
期刊Journal of Applied Physics
74
發行號11
DOIs
出版狀態Published - 1993

All Science Journal Classification (ASJC) codes

  • 物理與天文學 (全部)

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