二维磁通随机钉扎系统动力学行为的数值模拟  

NUMERICAL STUDY ON THE TWO DIMENSIONAL VORTEX SYSTEM WITH RANDOM PINNING

作　　者：曹义刚[1] 余亚斌[1] 焦正宽[1] 

机构地区：[1]浙江大学物理系,杭州310027

出　　处：《低温物理学报》1999年第5期359-362,共4页Low Temperature Physical Letters

摘　　要：本文利用数值模拟的方法，研究在Ｌｏｒｅｎｔｚ 驱动力作用下，随机钉扎环境中运动的二维磁通点阵的动力学行为．通过对不同随机分布点钉扎中心密度和不同磁通间相互作用强度的研究，发现磁通点阵存在从弹性区向塑性区的渡越（ｃｒｏｓｓｏｖｅｒ） ， 并且这种渡越强烈依赖于磁通之间及磁通与钉扎之间的相互作用．随着钉扎中心密度的增加及磁通间相互作用强度的减弱，临界钉扎力增强．模拟结果与最近实验结果定性一致．We study numerically the dynamic behavior of the two-dimensional (2 D ) vortex lattice, moving in a random pinning potential under the action of an external driving force. The elastic and plastic regimes are found to be dependent on the relation between the vortex vortex and vortex pin interacting potentials. The critical driving force increases with increasing density of pinning centers and with decreasing of the vortex vortex interacting strength. The simulated results are consistent with the recent experiments, and some of our results fall outside the region of validity of the collective pinning theory.

关 键 词：二维磁通 超导体 随机钉扎系统 动力学行为 模拟 

分 类 号：TM260.14[一般工业技术—材料科学与工程]