作　　者： ; ; ; ; ; ; ; ; (威震中）;

机构地区： 中国科学技术大学物理学院物理系

出　　处： 《低温物理学报》 1991年第3期197-200,共4页

摘　　要： 我们用 Hall 效应和磁场下展宽的电阻-温度(R-T)曲线研究了 YBa_2Cu_3O_(7-δ)外延生长薄膜中的磁通运动规律.从展宽的 R-T 曲线中,得到了磁通蠕动激活能与磁场之间满足的指数关系;而从 Hall 系数 R_H 的测量中,发现了与 R-T 展宽相对应的 Hall 系数反常变化.对整个 R-T 和 R_H-T 曲线的变化,我们借用磁通玻璃模型来进行描述,从不同的角度,揭示了磁通运动的规律. We have studied the movements of the flux lines in the YBa2Cu3O7-δ epitaxial film by Hall effect and the broadening of the resistance-temperature curves (R-T curves) in the magnetic field.From the broadened R-T curves we obtained the exponent relation between the value of the activation energy of the flux creep and the value of the field.From the measurements of the Hall coefficient RH we found the unusual variation of the Hall coefficient corresponding to the broadening of the R-T curves.We have also discussed all of the variations in the R-T curves as well as the RH-H curves by the vortex glass model,exploring the laws of the flux creep in different ways.

关 键 词： 薄膜 磁通蠕动 外延生长

领　　域： [电气工程] [一般工业技术]