Critical current densities (Jc) due to artificially designed pinning structure composed of randomly oriented Nb/Nb-Ti or Ti/Nb-Ti multilayer clusters in Nb-Ti superconducting wires are investigated in terms of recent works on magnetic phase diagrams of the metallic superconducting multilayer system. Upper critical field (Bc2)-temperature curves of the Nb-Ti superconducting wires with artificial pinning structures have an anomalous upturn of Bc2. This behavior is similar to the dimensional crossover which occurs in the superconducting multilayer system. From Jc and anomalous Bc2 properties in the Nb-Ti superconducting wires with artificial pinning strutures, we propose the flux pinning mechanism of these systems, especially in the high field region at 4.2 K.
|ジャーナル||Nippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals|
|出版物ステータス||出版済み - 1 1 1997|
All Science Journal Classification (ASJC) codes
- Condensed Matter Physics
- Mechanics of Materials
- Metals and Alloys
- Materials Chemistry