Steady-state and equilibrium vortex configurations, transitions, and evolution in a mesoscopic superconducting cylinder
Steady-state and equilibrium vortex configurations, transitions, and evolution in a mesoscopic superconducting cylinder
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DOI：
10.1103/physrevb.69.094521
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发表时间：
2003-08
影响因子：
3.7
通讯作者：
Sangbum Kim;Chia-Ren Hu;M. Andrews
中科院分区：
文献类型：
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作者：
Sangbum Kim;Chia-Ren Hu;M. Andrews
介绍了一种研究介观ii型超导圆筒内混合态的数值格式。给出了不同外加磁场H值下磁涡的稳态结构和瞬态特性。随着H的变化，不同多涡状态之间的转换通过等高线图和B / H图的跳跃来证明。我们用最简单的松弛方程组演化出均匀超导初始态。结果表明，该系统经过了接近亚稳态的中间构型，同时寻求符合样品方对称性的最终最小能量稳态。本文设计并演示了一种在任意给定场下确定介观系统平衡涡构型的有效方法，而不受系统对称性的限制。
A numerical scheme to study the mixed states in a mesoscopic type-II superconducting cylinder is described. Steady-state configurations and transient behavior of the magnetic vortices for various values of the applied magnetic field H are presented. Transitions between different multivortex states as H is changed is demonstrated by contour plots and jumps in the B vs H plot. We evolve a uniformly superconducting initial state using the simplest set of relaxation equations. The results reveal that the system passes through nearly metastable intermediate configurations while seeking the final minimum-energy steady state consistent with the square symmetry of the sample. An efficient scheme to determine the equilibrium vortex configuration in a mesoscopic system at any given applied field, not limited to the symmetry of the system, is devised and demonstrated.