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CRITICAL CURRENT DENSITY AND FLUX PINNING CHARACTERISTICS IN MELT-TEXTURED Y0.6Er0.4Ba2Cu3Oy SUPERCONDUCTOR
Feng Yong, Zhou Lian, Shi Lei, Yang Wan-min, Zhang Cui-ping, Wang Jing-rong, Du Ze-hua, Yu Ze-min, Wu Xiao-zu, Zhang Yu-heng
1999, 8 (5):
374-382.
doi: 10.1088/1004-423X/8/5/009
Abstract
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PDF (266KB)
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We prepared highly textured YBa2CuOy and Y0.6Er0.4Ba2Cu3Oy bulk samples by a powder melting process method under the same conditions and studied the magnetic properties and flux pinning character istics. It is found that the Jc estimated by the Bean's model decreases with the magnetic field according to a power law Jc∝B-n (n<0.55), suggesting that Jc values of these materials are controlled by the flux pinning rather than weak links. Also, Jc and flux pinning are improved by the Er addition. The reduction of the size of Y2BaCuO5 particles, magnetic pinning and stress-field pinning caused by the Er addition may be responsible for the enhancement of Jc and flux pinning.
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