JUMP AND CREEP OF FLUX IN HIGH T_c OXIDE Tl_4Ba_3Ca_3Cu_4O_y BULK SUPERCONDUCTOR

作     者：曹效文 黄孙利 张凤英 龙香云 彭获田 彭秋云 齐志伟 吴裕生 方俊人 张伟杰 刘宏宝 毛向雷 张裕恒 

作者机构：Institute of Plasma Physics Academia Sinica Hefei 230031 PRC Changsha Research Institute of Mining and Metallurgy Changsha 410000 PRC University of Science and Technology of China Hefei 230027 PRC 

出 版 物：《Science China Mathematics》 (中国科学：数学（英文版）)

年 卷 期：1990年第33卷第9期

页      面：1082-1088页

核心收录：

学科分类：07[理学] 08[工学] 

基　　金：Project supported by the National Center for Research and Development of Superconductivity 

主　　题：flux jump flux creep superconductor. 

摘      要：In the magnetization curve of Tl_4Ba_3Ca_3Cu_4O_y, bulk superconductor, there exists an anomaly of magnetization in the magnetic field lower than H_(Cl). The time dependence of DC magnetization in zero-field-cooled sample has been investigated. The experimental result shows that there are giant flux creeps and flux jumps during the flux creep. The magnetization decay rate depends upon both the field and the temperature. The thermal activation of flux lines for U_0≈0.14 eV at 77.3 K is discussed.