Fabrication of YBa2Cu3O7-y Bulk Superconductor Through Melt Growth

A YBa2Cu3O7-y bulk with the crystal orientation identical with that of single seed was grown from the seed by the application of melt growth, wherein YBa2Cu3O7-y superconductive green compact was placed on the upper part of Sm 123 superconductive seed single crystal. Field cooling was employed as the condition for the measuring magnetic levitation; it was measured at the temperature of liquid nitrogen, utilizing a Nd–Fe-B permanent magnet with the force of 3.86 kG. The magnetic levitation measurements yielded values of 23.537 N on the surface of the upper part and 30.562 N at the bottom of superconductive bulk magnet. The trapped magnetic forces on the surfaces of superconducting specimens were measured using a permanent magnet with a surface magnetic force of 5.25 kG. The measurements yielded values of 1.74 kG on the upper surface and 1.82 kG at the bottom of the superconducting bulk magnet. Superconducting single crystals were grown from specimens obtained from the upper and bottom parts of the bulk magnet. These specimens were prepared using the melt reaction process. The superconducting properties, such as magnetic levitation and trapped magnetic force, were found to be higher in the region that came into contact with the seed crystal.