| 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 |
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| 引用本文： | 王绪威,李存健,储少岩.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[J].北京航空航天大学学报,1994(3). |
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| 作者姓名： | 王绪威 李存健 储少岩 |
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| 作者单位： | 北京航空航天大学应用数理系 |
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| 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．
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| 关 键 词： | 超导材料 磁性 约瑟夫森效应 弱连接 |
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 |
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| Wang Xuwei,Li Cunjian,Chu Shaoyan.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[J].Journal of Beijing University of Aeronautics and Astronautics,1994(3). |
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| Authors: | Wang Xuwei Li Cunjian Chu Shaoyan |
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| Institution: | Beijing University of Aeronautics and Astronautics. Dept. of Applied Mathematics and Physics |
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| Abstract: | 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. |
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| Keywords: | superconducting materials: magnetism: Josephson effect: weak-link |
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