涡旋纳米晶体中的约束诱导拓扑缺陷过剩
Excess of topological defects induced by confinement in vortex nanocrystals
摘要：
我们直接在纳米晶体中的个别涡旋位置的图像，以揭示的结构属性，有助于消耗的熵跳在一级过渡。在减小尺寸时，拓扑缺陷的密度在特征长度上在边缘附近增加。在这个“愈合长度”的距离，从样品的边缘涡行倾向于弯曲，而朝向样品的中心，涡结构的位置顺序是什么是预期的布拉格玻璃相。这表明愈合长度可能是模拟极端层状涡旋纳米晶体一级相变中熵跃变耗尽的一个关键量。
英文摘要：
We directly image individual vortex positions in nanocrystals in order to unveil the structural property that contributes to the depletion of the entropy-jump entailed at the first-order transition. On reducing the nanocrystal size the density of topological defects increases near the edges over a characteristic length. Within this "healing-length" distance from the sample edge vortex rows tend to bend while towards the center of the sample the positional order of the vortex structure is what is expected for the Bragg-glass phase. This suggests that the healing-length may be a key quantity to model the entropy-jump depletion in the first-order transition of extremely-layered vortex nanocrystals.
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