Dislocations and vortices in pair-density-wave superconductors
Dislocations and vortices in pair-density-wave superconductors
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DOI：
10.1038/nphys999
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发表时间：
2008-08-01
期刊：
影响因子：
19.6
通讯作者：
Tsunetsugu, H.
中科院分区：
文献类型：
--
作者：
Agterberg, D. F.;Tsunetsugu, H.
随着Fulde、Ferrell、Larkin和Ovchinnikov的开创性工作，人们意识到超导序也可以打破平移不变性，导致库珀对发展出相干周期性空间振荡结构的阶段。这种对密度波（PDW）超导性已经在各种系统中变得相关，包括铜酸盐，有机超导体，重费米子超导体，冷原子和高密度夸克物质。在这里，我们表明，除了电荷密度波（CDW）秩序，有PDW基态诱导自旋密度波（SDW）秩序时，没有施加磁场。此外，我们表明，PDW相支持的拓扑缺陷，联合收割机位错在诱导CDW/SDW秩序与分数涡旋在通常的超导秩序。这些缺陷提供了一种机制，波动驱动的非超导CDW/SDW相和常规的涡旋与CDW/SDW秩序的核心。
With the groundbreaking work of Fulde, Ferrell, Larkin and Ovchinnikov, it was realized that superconducting order can also break translational invariance, leading to a phase in which the Cooper pairs develop a coherent periodic spatially oscillating structure. Such pair-density-wave (PDW) superconductivity has become relevant in a diverse range of systems, including cuprates, organic superconductors, heavy-fermion superconductors, cold atoms and high-density quark matter. Here we show that, in addition to charge-density-wave (CDW) order, there are PDW ground states that induce spin-density-wave (SDW) order when there is no applied magnetic field. Furthermore, we show that PDW phases support topological defects that combine dislocations in the induced CDW/SDW order with a fractional vortex in the usual superconducting order. These defects provide a mechanism for fluctuation-driven non-superconducting CDW/SDW phases and conventional vortices with CDW/SDW order in the core.