Abstract
A series of YBCO single domain samples were prepared by using the top seeded melt growth method with different cooling rate during the melt processing. For all of the samples, the DC magnetization and the levitation force were measured to determine the effects of cooling rate on the critical transition temperature T c magnetization critical current density J cm and levitation force F. The results indicate the influence of cooling rate on superconducting properties is very strong and the cooling rate has an optimum range. For instance, the rates of 0.9–1.1 °C/h are suitable for the sample with 11 mm in diameter, above which single domain size becomes small and below which the superconducting properties degrade obviously. The similar result has been also observed for the sample with 30 mm in diameter.
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