Abstract

Interaction between permanent magnets and YBCO bulk superconductors prepared by the Quench and Melt Growth (QMG) process was investigated. An apparatus to measure forces to a permanent magnet from bulk superconductors was developed by modification of a tension/compression testing machine. Strong repulsion force as high as 10.2 kgf was observed. This high value is attributed to the resistance to magnetic flux penetration into the bulk. The sample without grain boundary showed the highest repulsion force. This resulted from the avoidance of flux penetration through the grain boundary. The attraction force and trapped magnetic flux density after field cooling was also larger in the sample without grain boundary. The modified QMG process which enabled us to obtain large YBCO bulk proved to be effective for high a performance bulk superconductor.

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