【摘要】 为了更准确地分析高温超导体在高温如液氮温区的磁通钉扎机制 ,基于Dew Hughes模型 ,对传统的钉扎力标度方法进行了改进 ,发展了钉扎力密度的多源分析方法 .在高温超导体中芯钉扎机制处于主导地位 ,由正常相和Ginzburg参量 (Δκ)变化引起的点、面和体缺陷在改进分析方法中均将考虑 .论文中通过几个Bi 2 2 2 3/Ag带材的钉扎力分析实例对传统的单函数方法和改进多源分析方法进行了比较 .结果表明 ,采用多源分析方法可以更准确地给出样品中起作用的钉扎机制的信息 ,例如 ,样品中对磁通钉扎有贡献钉扎中心类型及其相对强度等 .更多还原

【Abstract】 To analyze the flux pinning in high temperature superconductors (HTS) more accurately at high temperature such as 77K, an improved method based on Dew Hughes model has been developed. Assumed that core pinning is dominant in HTS, point, surface and volume pinning center in samples caused by normal phase and spatial variations of the Ginzburg parameter (Δ κ ) have been considered. As a comparison, the pinning forces of several Bi 2223 silver sheathed (Bi 2223/Ag) tapes have been scaled by traditional single function and improved multi elementary function. The results indicated that more detail on the pinning mechanism in samples, such as the relative pinning strength of each active pinning center, could be given by the multi elementary scaling.更多还原