Fabrication of large single-domained Y-Ba-Cu-O superconductor by multiseeding in top-seeded melt growth

摘要

Y-Ba-Cu-O superconductors were prepared by TSMG (Top-Seeded Melt Growth) process with multiseeding technique. by using several seeds at the same time, large samples could be fabricated in a short time with simple heat treatment. However, the samples fabricated by normal multiseeding technique show decrease of trapped magnetic field values across the grain boundaries because of the residual liquid layer. To remove the residual liquid layer, modified multiseeding was newly suggested. The individual grains were combined as single domain, and did not show deterioration of magnetic property at the boundary. The formation mechanism of a well-combined domain by multiseeding technique was discussed.