CITE.CC academic search helps you expand the influence of your papers.
Abstract
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. Unconventional superconductors often host two or more competing states at low temperatures. Line defects seemingly have a role in the relative stability of coexisting density waves that oscillate in space.
Cite this article
Agterberg, D., Tsunetsugu, H. Dislocations and vortices in pair-density-wave superconductors. Nature Phys 4, 639–642 (2008). https://doi.org/10.1038/nphys999