拓扑缺陷涡旋晶格的脱钉和临界电流特性
Depinning and critical current characteristics of topologically defected vortex lattices
摘要：
我们讨论的位错组装，如晶界的驱动涡旋晶格的动态响应中的作用。我们模拟了场冷却涡旋多晶的脱钉扎，并观察到临界电流的普遍增强以及作为钉扎密度的函数的这个量的特征中的明显交叉。结果与分析预测的晶界脱钉。晶界的动力学，从而证明了一个基本的机制，缺陷的涡流晶格的流动响应和相应的超导材料的传输特性。我们强调的拓扑重排的晶格和它的阈值动力学之间的连接。我们的理论包括各种实验观察涡旋物质以及胶体晶体。
英文摘要：
We discuss the role of dislocation assemblies such as grain boundaries in the dynamic response of a driven vortex lattice. We simulate the depinning of a field-cooled vortex polycrystal and observe a general enhancement of the critical current as well as a distinct crossover in the characterisitic of this quantity as a function of pinning density. The results agree with analytical predictions for grain boundary depinning. The dynamics of grain boundaries thus proves an essential mechanism underlying the flow response of defected vortex lattices and the corresponding transport properties of the superconducting material. We emphasize the connection between the topological rearrangements of the lattice and its threshold dynamics. Our theory encompasses a variety of experimental observations in vortex matter as well as in colloidal crystals.
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