中子辐照熔融织构YBa_2Cu_3O_y的临界电流  

CRITICAL CURRENT DENSITY IN NEUTRON IRRADIATED BULK YBa_2Cu_3O_y

作　　者：卫崇德 刘尊孝[1] 甘子钊[1] 任洪涛[2] 肖玲[2] 贺庆[2] 

机构地区：[1]北京大学物理系,北京100871 [2]北京有色金属研究总院,北京100088

出　　处：《物理学报》1992年第11期1884-1890,共7页Acta Physica Sinica

摘　　要：测量了中子辐照熔融织构YBa_2Cu_3Oy样品从1.5 K到85K之间一系列温度下的磁化曲线。磁场H平行于c轴时,在6K观察到磁通跳跃。中子辐照可使临界电流提高一个数量级。分析了临界电流的各向异性,辐照增强与磁场的关系和主要的钉扎中心。讨论了磁通跳跃的物理模型。The magnetization curves of neutron irradiated bulk YBa2Cu3Oy prepared by melt-textured growth method were measured from 1.5 to 85 K. Flux jumps were observed for H//c at 6K. The anisotropies of critical current are analysed in detail- The pinning mechanism and physical model for flux jumps are discussed.

关 键 词：YBCO 高温超导性 辐照 中子 

分 类 号：O511.1[理学—低温物理]