Bi_(1.9)Pb_(0.3)Sr_(2.0)Ca_(1.7)Mg_(0.3)Cu_(3.1)O_x 超导块材弱连接区的低磁场性  

MAGNETIC PROPERTIES OF WEAK-LINK IN Bi_(1.9)Pb_(0.3)Sr_(2.0)Ca_(1.7)Mg_(0.3)Cu_(3.1)O_x BULK SUPERCONDUCTIVE MATERIAL UNDER LOW FIELD

作　　者：王绪威[1] 李存健[1] 储少岩 

机构地区：[1]北京航空航天大学应用数理系

出　　处：《北京航空航天大学学报》1994年第3期336-342,共7页Journal of Beijing University of Aeronautics and Astronautics

基　　金：航空科学基金

摘　　要：通过对在不同外磁场下Ｂｉ１．９Ｐｂ０．３Ｓｒ２．０Ｃａ１．７Ｍｇ０．３Ｃｕ３．１Ｏｘ超导块材的交流磁化率的测量，获得了样品内晶粒间和晶粒内对外场的不问响应范围．通过与粉状样品实验结果的比较和Ｘ光分析，认为块状样品在温度为１００Ｋ左右出现的抗磁台阶是样品内晶粒间超导弱连接的一种抗磁效应．对弱连接区有效钉扎力Ｆｐ和临界电流密度Ｊｃ与外场Ｈ的关系进行了讨论．A.C.susceptibility of Bi1.9Pb0.3Sr,2.0Ca,1.7Mg0.3Cu3.1Ox bulk superconductive material hasbeen measured under the low magnetic field. The different response ranges to applied mag-netiZ field are determined for intergrain and intragrain from X--H curve at 80 K. From X--raydiffraction analysis and A.C.susceptibility measurement as the function of temperature withdifferent applied magnetic field in bulk sample and powder sample. we got conclusion that thestep about 100 K in bulk smaple is a diamagnetic effect of weak--link superconductivity. Theformation of the step and why the step appears about 100 K are discussed and explained. Therelation between effective pinning force Fp. critical current density J. of weak--link and appliedmagnetic field H are discussed.

关 键 词：超导材料 磁性 约瑟夫森效应 

分 类 号：TM26[一般工业技术—材料科学与工程]