考虑到有效钉扎势U（J）与临界电流密度的非线性关系,将U（J）展开为三级泰勒级数,最后推导出一个普遍适用于描述高温超导体磁弛豫的等温衰减方程,并用这一方程研究了具有高J c ,强钉扎的区域熔炼法制备YBa 2 Cu 3 O 6+x 的磁弛豫,而且对目前被普遍采用的几个钉扎模型进行了讨论.

This work studies the effect and mechanism of slow neutron irradiation of low fluence (～108n/cm2) in normal resistivity of Y and Bi system and the doped high Tc superconductors. The experimental results indicate that the normal resistivity R not only follows the law that R is increasing exponentially with the enhancement of fluence φn, but also decreases greatly after irradiation of slow neutron with low fluence.