Top-seeded melt growth of Y-Ba-Cu-O superconductor with multiseeding

摘要

Y-Ba-Cu-O superconductors were prepared by thetop-seeded melt growth process with multiseeding technique. Byusing several seeds at the same time, large samples could befabricated in a short time with simple heat treatment. However, thesamples fabricated by the normal multiseeding technique show arapid decrease of trapped magnetic field value across the grainboundaries because of the residual liquid layer. To remove theresidual liquid layer, various types of multiseeding were newlysuggested. The optimum result was obtained when the seeds werearranged without spacing. The individual grains were combined asa single domain and did not show any deterioration of magneticproperties at the boundary. The formation mechanism of a well-combined single domain by the multiseeding technique is discussed.