中国物理B ›› 1999, Vol. 8 ›› Issue (5): 374-382.doi: 10.1088/1004-423X/8/5/009

• • 上一篇    下一篇

CRITICAL CURRENT DENSITY AND FLUX PINNING CHARACTERISTICS IN MELT-TEXTURED Y0.6Er0.4Ba2Cu3Oy SUPERCONDUCTOR

冯勇1, 周廉1, 杨万民1, 张翠萍1, 汪京荣1, 杜泽华1, 于泽民1, 吴晓祖1, 石磊2, 张裕恒2   

  1. (1)Northwest Institute for Nonferrous Metal Research, Xi'an 710016, China; (2)Structure Research Laboratory, University of Science and Technology of China, Hefei 230026, China
  • 收稿日期:1998-07-23 出版日期:1999-05-15 发布日期:1999-05-20

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   

  1. 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
  • Received:1998-07-23 Online:1999-05-15 Published:1999-05-20

PDF (PC)

535

赞

摘要： 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.

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.

中图分类号:  (Critical currents)

  • 74.25.Sv
74.25.Ha (Magnetic properties including vortex structures and related phenomena) 74.81.Bd (Granular, melt-textured, amorphous, and composite superconductors)