高能重离子辐照对氧化物高温超导体的临界电流密度的影响及磁通钉扎机制的探讨  

The effect and mechanism of high energy heavy ions irradiation on the critical current density and pinning of high temperature superconductors

作　　者：沙建军[1] 赵新杰[1] 郁金南[2] 

机构地区：[1]宁夏大学物理与电气信息工程系,宁夏银川750021 [2]中国原子能科学研究院反应堆工程设计研究所,北京102413

出　　处：《宁夏大学学报（自然科学版）》2000年第2期122-125,共4页Journal of Ningxia University(Natural Science Edition)

基　　金：宁夏区科委科研基金资助项目

摘　　要：运用层状高温超导体的临界电流密度理论模型 ,对 180MeV的Cu11+ 辐照高温超导体Y— 12 3和Bi— 2 2 12的临界电流密度的影响做了分析 ,并对试验结果进行了拟合 .拟合结果与试验结果符合得较好 ,这表明辐照产生的柱状缺陷作为主要的钉扎中心 ,具有较高的钉扎能 ,且柱状缺陷在直径上与磁通涡旋有相近的尺寸 .In this paper,a theoretical model of critical current density for the layered high temperature superconductors was used to analyze the radiation effects on Y—123 and Bi—2212 phase superconductors irradiated by 180 MeV Cu 11+ .The experimental results show the critical current density can be much improved by Cu 11+ irradiation and it can be well fitted by the model. Irradiation with 180 MeV Cu 11+ introduced the columnar defects, which act as strong and effective pinning center with a high pinning potential even at high field and high temperature,because the core size of pancake vortices is comparable to that of defects and vortices are effectively pinned by the defects.

关 键 词：层状超导体 磁通钉扎 氧化物 临界电流密度 

分 类 号：TM262.014[一般工业技术—材料科学与工程] O511.2[电气工程—电工理论与新技术]