標題: | Interaction between a cylindrical superconducting impurity and a vortex in a type-II superconductor |
作者: | Wei, JC Chen, JL Liu, RS Yang, TJ 電子物理學系 光電工程學系 Department of Electrophysics Department of Photonics |
公開日期: | 10-二月-1997 |
摘要: | We examined the effectiveness of an infinite cylindrical superconducting impurity of radius a in an infinite type-II superconductor as a pinning center. The impurity and the superconducting background have the penetration depth lambda(i) and lambda(s), respectively. With regard to a single-quantum vortex, the free energy of the system and the pinning potential for a vortex were calculated, based upon the London model of the vortex line. Here, the pinning potential U-pin is defined by the difference between the free energy of a vortex being at the center of the impurity and that being infinitely distant from the impurity. U-pin is negative for lambda(i) > lambda(s). On the other hand, U-pin is positive for lambda(i) < lambda(s). In the limit of a much greater than lambda(i) and lambda(s), the pinning potential is found to be U-pin = phi(0)(2)(1/lambda(i)(2) - 1/lambda(s)(2)) ln kappa/4 pi mu(0). In the limit of a much less than lambda(i) and lambda(s), the pinning potential is found to be U-pin = phi(0)(2)[(1/lambda(i)(2) - 1/lambda(ss)(2)) ln(lambda(s)/a) - (1/lambda(i)(2)) ln(lambda(i)/a)]/4 pi mu(0). There is a clear correlation between the intrinsic property of these two superconducting materials and the pinning potential. |
URI: | http://hdl.handle.net/11536/726 |
ISSN: | 0921-4534 |
期刊: | PHYSICA C |
Volume: | 275 |
Issue: | 1-2 |
起始頁: | 135 |
結束頁: | 140 |
顯示於類別: | 期刊論文 |