Flux pinning property in a single crystal NdBa2Cu3Oy superconductor

✍ Scribed by M.N. Hasan; T. Kurokawa; M. Kiuchi; E.S. Otabe; T. Matsushita; N. Chikumoto; T. Machi; M. Muralidhar; M. Murakami

• Publisher: Elsevier Science
• Year: 2005
• Tongue: English
• Weight: 138 KB
• Volume: 426-431
• Category: Article
• ISSN: 0921-4534
• DOI: 10.1016/j.physc.2005.01.024

✦ Synopsis

The critical current density J c and the apparent pinning potential U Ã 0 in a single crystal NdBa 2 Cu 3 O y superconductor which shows a broad peak effect are investigated by measuring a DC magnetization and its relaxation. The field-induced pinning mechanism does not explain the temperature dependence of peak field B p and dip field B d . The experimental results of J c and U Ã 0 are compared with the theoretical analysis based on the flux creep-flow model, taking the distribution of the flux pinning strength into account. The number of flux lines in the flux bundle (g 2 ), the most probable value of pinning strength (A m ) and distribution width (r 2 ) are determined so that a good fit is obtained between the experimental and theoretical results. The behavior of these parameters is discussed in correspondence to the disorder transition of flux lines.