Abstract
YBa2Cu3O7–y (YBaCuO) superconductors used in energy storage devices are superconducting permanent magnets in bulk form. YBaCuO bulk superconductors are fabricated by interior seeded melt growth. Because the seed crystal growth is based on a slow diffusion reaction, long-term heat treatment is required to fabricate a single crystal in order to improve the magnetic properties of the bulk YBaCuO superconductor. We fabricated a single-grain bulk YBaCuO superconductor by controlling the distance between the seed and the upper surface of the YBaCuO bulk. The magnetic levitation force and trapped magnetic field were measured for the YBaCuO superconducting bulk. The correlation between the superconducting magnetic properties of the specimens and the microstructure of each crystallographic plane were evaluated.
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