Symmetry-induced giant vortex state in a superconducting Pb film with a fivefold Penrose array of magnetic pinning centers.
Symmetry-induced giant vortex state in a superconducting Pb film with a fivefold Penrose array of magnetic pinning centers.
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DOI：
10.1103/physrevlett.103.067007
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发表时间：
2009-04
影响因子：
8.6
通讯作者：
R. Kramer;A. Silhanek;J. Vondel;B. Raes;V. Moshchalkov
中科院分区：
文献类型：
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作者：
R. Kramer;A. Silhanek;J. Vondel;B. Raes;V. Moshchalkov
通过使用扫描霍尔探针显微镜绘制局部场分布图，获得了覆盖五层彭罗斯钴点阵列的铅膜中的磁通分布的直接可视化。我们证明了对于大约0.8H_{1}、H_{1}和1.6H_{1}的场H可以找到稳定的涡旋构型，其中H_{1}对应于每个钉扎位置一个磁通量。0.8H_{1}处的涡型对应于薄瓷砖其中一个顶点上的一个空位，而在1.6H_{1}处，涡旋结构可以与每个厚瓷砖内部的一个间隙涡相关联。值得注意的是，对于H=1.6H{1}，间隙涡和钉扎涡排列成环形结构(“涡圈”)，这有利于在其中心形成一个巨大的涡旋态。
A direct visualization of the flux distribution in a Pb film covering a fivefold Penrose array of Co dots is obtained by mapping the local field distribution with a scanning Hall probe microscope. We demonstrate that stable vortex configurations can be found for fields H approximately 0.8H_{1}, H_{1}, and 1.6H_{1}, where H_{1} corresponds to one flux quantum per pinning site. The vortex pattern at 0.8H_{1} corresponds to one vacancy in one of the vertices of the thin tiles, whereas at 1.6H_{1} the vortex structure can be associated with one interstitial vortex inside each thick tile. Strikingly, for H = 1.6H_{1}, interstitial and pinned vortices arrange themselves in ringlike structures ("vortex corrals") which favor the formation of a giant vortex state at their center.