Critical Current Density and Pinning Energy of Partial Melted Sm-Based Superconductor

Abstract

The relationship between critical current density (Jc) and pinning energy (Up) in partial melted superconductors was investigated. The partial melted Sm-Ba-Cu-O superconducting bulks were composed of SmBa2Cu3Ox (Sm-123) superconductor and Sm2BaCuOy (Sm-211) insulator. The pinning force and the pinning energy of the superconductor were measured by a system combining an electronic balance and permanent magnet. The pinning energy and the Jc of the samples were influenced by crystalline orientation. The Jc of the samples depends on the pinning energy. However, in the partial melting process, changes in retention temperature altered the Jc values but had little effect on the value of the pinning energy. The results indicated that Jc was influenced by the dispersion of the insulator acting as a pinning center with in the superconducting bulks.