Thermal properties and applications of high-T-c (Nd,Eu,Gd) Ba2Cu3Oy bulk superconductors

In the newly approved Joint Research Project for Regional Intensive in Iwat e; "Development of practical application of magnetic field technology for u se in the region and in everyday living", application of magnetic field env ironments realized by high TC bulk superconductors is one of the main R&D s ubjects. Numerical analyses on scattering mechanisms in the thermal conduct ivity of (Nd,Eu,Gd)Ba2Cu3Oy[NEC(123)] bulk superconductors with 10, 20, 30 mol% NEG(211) second phase (SP) were performed. We found a strong correlati on between amount of added second phase and scatterings by grain boundary a nd Umklapp process. Performance of power leads made of [NEG(123) + 30 mol%S P] bulk superconductor for strong stray magnetic field environment was also estimated. (C) 2000 Elsevier Science B.V. All rights reserved.