Pinning-induced formation of vortex clusters and giant vortices in mesoscopic superconducting disks
Pinning-induced formation of vortex clusters and giant vortices in mesoscopic superconducting disks
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DOI：
10.1103/physrevlett.99.147003
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发表时间：
2007-10-05
影响因子：
8.6
通讯作者：
Dubonos, S. V.
中科院分区：
文献类型：
--
作者：
Grigorieva, I. V.;Escoffier, W.;Dubonos, S. V.
众所周知，由于磁通量的强约束，合并或巨大的多量子涡旋（GV）会出现在超导转变附近的非常小的超导体中。在这里，我们提出了一个新的证据，钉扎相关的，涡合并的机制。使用Bitter装饰可视化小Nb盘中的涡旋与不同程度的混乱，我们表明，结合强无序的限制导致个别涡旋合并成集群，甚至GVs远低于T-C和H-C2，在没有钉扎的情况下，个别涡旋的定义明确的外壳。
Merged, or giant, multiquanta vortices (GVs) are known to appear in very small superconductors near the superconducting transition due to strong confinement of magnetic flux. Here we present evidence for a new, pinning-related, mechanism for vortex merger. Using Bitter decoration to visualize vortices in small Nb disks with varying degrees of disorder, we show that confinement in combination with strong disorder causes individual vortices to merge into clusters or even GVs well below T-c and H-c2, in contrast to well-defined shells of individual vortices found in the absence of pinning.