CRITICAL CURRENT DENSITY AND FLUX PINNING CHARACTERISTICS IN MELT-TEXTURED Y0.6Er0.4Ba2Cu3Oy SUPERCONDUCTOR
Feng Yong (冯勇)a, Zhou Lian (周廉)a, Shi Lei (石磊)b, Yang Wan-min (杨万民)a, Zhang Cui-ping (张翠萍)a, Wang Jing-rong (汪京荣)a, Du Ze-hua (杜泽华)a, Yu Ze-min (于泽民)a, Wu Xiao-zu (吴晓祖)a, Zhang Yu-heng (张裕恒)b
a Northwest Institute for Nonferrous Metal Research, Xi'an 710016, China; b Structure Research Laboratory, University of Science and Technology of China, Hefei 230026, China
Abstract 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.
Received: 23 July 1998
Accepted manuscript online:
Feng Yong (冯勇), Zhou Lian (周廉), Shi Lei (石磊), Yang Wan-min (杨万民), Zhang Cui-ping (张翠萍), Wang Jing-rong (汪京荣), Du Ze-hua (杜泽华), Yu Ze-min (于泽民), Wu Xiao-zu (吴晓祖), Zhang Yu-heng (张裕恒) CRITICAL CURRENT DENSITY AND FLUX PINNING CHARACTERISTICS IN MELT-TEXTURED Y0.6Er0.4Ba2Cu3Oy SUPERCONDUCTOR 1999 Acta Physica Sinica (Overseas Edition) 8 374
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