交流磁化率方法研究磁通钉扎能与电流关系  

STUDY OF THE RELATION BETWEEN THE FLUX PINNING ENERGY AND CURRENT BASED UPON AC SUSCEPTIBILITY METHOD

作　　者：林建伟[1] 丁世英[1] 王国强[1] 任聪[1] 姚希贤[1] 彭获田 彭秋云[1] 周思海[1] 

机构地区：[1]河海大学数理系,南京大学物理系和固体微结构物理实验室,长沙矿冶研究院

出　　处：《低温物理学报》1995年第6期459-465,共7页Low Temperature Physical Letters

摘　　要：本文介绍如何利用交流磁化率来测量高温超导体与电流密度Ｊ，直流场Ｈｄ和温度Ｔ有关的磁通钉能Ｕ（Ｊ，Ｈｄ，Ｔ）．根据磁通扩散理论和随外场变化的交流磁化率虚部Ｘ″峰温的系统实验研究，就可以得到上述能量函数．对掺Ｐｂ和Ｂａ的ＴｌＳｒ２Ｃａ２Ｃｕ３Ｏｙ超导体的系统交流磁化率的测量和分析得到的结果为Ｕ（Ｊ，Ｈｄ，Ｔ）∝Ｊ－μＨｄ－ｖ（１－（Ｔ／Ｔｃ）２）２，式中μ＝０．５９，ｖ＝１．１和Ｔｃ＝１１７Ｋ．这一结果与磁通玻璃态的理论预言一致，这可能是这种Ｔ１基材料存在涡旋玻璃的一个实验证据．Abstract A method according to which how to measure the current density J, dc magnetic field Hd and temperature T dependent pinning energy U (J, Hd, T) for high Tc superconductor by means of ac susceptibility has been introduced. Based upon the the flux diffusion theory and the systematic experimental study for the peak temperature of the imaginary part of ac susceptibility X', which is applied field dependent, the above energy function can be obtained. The systematic measurement and analysis of the ac susceptibility for superconductor TlSrCa2Cu3Oy,which is doped with Ph and Ba, show a result of U (J, Hd, T) ∝J-μHd-v[1 - (Tp/Tc)2]2,where μ= 0. 59, v= 1. 1 and Tc= 117K. This result is consistence with the prediction of the votex glass theory, which may be an evidence of existing votex glass in the T1 based materials.

关 键 词：磁通钉扎能 超导体 高TC 交流磁化率 

分 类 号：O511.2[理学—低温物理]