高温超导体磁化率

SUSCEPTIBILITY STUDY ON HIGH T c SUPERCONDUCTORS

提出了一个平板模型，运用比恩临界态概念，对高温超导体的复磁化率进行了理论计算，得到了磁化率实部和虚部的解析表达式，从而解释了实验中观察到的交流磁场幅值Ｈｍ导致磁化率虚部展宽并向低温移动的现象。理论计算与实验观察到的结果符合得较好。

By using Bean's concept of critical state,the a.c. complex susceptibilities X=X′-iX′′ of high T c superconductors are calculated from the slab model presented in this paper, and an analytical equation for the real part X′ and the imaginary part X′′ of susceptibility is obtained.According to the results,the expending and shifting to low temperature of X′′ with the incease of a.c. field amplitude H m observed from experiment can be interpreted.The theoretical results are better agreement with the experimental data.