Stability and transition between vortex configurations in square mesoscopic samples with antidots
Stability and transition between vortex configurations in square mesoscopic samples with antidots
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DOI：
10.1103/physrevb.68.174521
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发表时间：
2003-11-01
影响因子：
3.7
通讯作者：
Peeters, FM
中科院分区：
文献类型：
--
作者：
Berdiyorov, GR;Baelus, BJ;Peeters, FM
利用完全非线性Ginzburg-Landau理论，研究了均匀垂直磁场中含有1 ~ 4个亚微米反点的介观正方形样品的超导态和相界.研究了不同涡旋态的性质、可能的简并以及它们之间的过渡。由于不同对称性的相互作用，不同反点数目和排列方式的样品中超导态的成核有着质的差别，这些结构的超导/正常态H-T相界显示出由这些小的钉扎中心（反点）簇中不同稳定涡旋组态的形成所引起的振荡行为。我们分析了这些组态的稳定性，并将超导相界与实验结果进行了比较。
Using the complete nonlinear Ginzburg-Landau theory, we investigated the superconducting state and phase boundaries for mesoscopic square samples containing one to four submicron antidots in the presence of a uniform perpendicular magnetic field. The properties of the different vortex states, possible degeneracies, and the transitions between them are studied. Due to the interplay of the different types of symmetry, a qualitative difference in the nucleation of the superconducting state in samples with different number or arrangement of antidots is found. The superconducting/normal state H-T phase boundary of these structures reveals an oscillatory behavior caused by the formation of different stable vortex configurations in these small clusters of pinning centers (antidots). We analyze the stability of these configurations and compare the superconducting phase boundary with experimental results.