大介观Bi（2）Sr（2）CaCu（2）O（8+delta）盘中的连续与离散磁通行为
Continuum versus discrete flux behaviour in large mesoscopic Bi(2)Sr(2)CaCu(2)O(8+delta) disks
摘要：
扫描霍尔探针和本地霍尔磁强计测量已被用来调查磁通分布在大型介观超导磁盘的大小，位于体和介观涡旋制度之间的交叉附近。通过直接映射在不同的应用领域的磁盘的磁感应曲线得到的结果可以相当成功地拟合到分析模型，假设在样品中的磁通量的连续分布。然而，在低磁场下，我们确实观察到了底层离散涡旋结构的清晰特征，并且可以解决涡旋团在增加的磁场中的特征介观压缩。即使在更高的领域，其中单一的涡流分辨率丢失，我们仍然能够跟踪的涡流图案的结构变化，因为竞争的涡流订单强加明确无误的签名上的“本地”磁化曲线作为一个功能的应用领域。我们的观察结果是非常一致的分子动力学数值模拟，使我们在我们的系统中的离散和连续行为之间的交叉的长度尺度的自然定义。
英文摘要：
Scanning Hall probe and local Hall magnetometry measurements have been used to investigate flux distributions in large mesoscopic superconducting disks with sizes that lie near the crossover between the bulk and mesoscopic vortex regimes. Results obtained by directly mapping the magnetic induction profiles of the disks at different applied fields can be quite successfully fitted to analytic models which assume a continuous distribution of flux in the sample. At low fields, however, we do observe clear signatures of the underlying discrete vortex structure and can resolve the characteristic mesoscopic compression of vortex clusters in increasing magnetic fields. Even at higher fields, where single vortex resolution is lost, we are still able to track configurational changes in the vortex patterns, since competing vortex orders impose unmistakable signatures on "local" magnetisation curves as a function of the applied field. Our observations are in excellent agreement with molecular dynamics numerical simulations which lead us to a natural definition of the lengthscale for the crossover between discrete and continuum behaviours in our system.
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