Pinning of dynamic spin density wave fluctuations in the cuprate superconductors
arXiv:cond-mat/0203176 · doi:10.1103/PhysRevB.65.220509
Abstract
We present a theory of the pinning of dynamic spin density wave (SDW) fluctuations in a d-wave superconductor by local imperfections which preserve spin-rotation invariance, such as impurities or vortex cores. The pinning leads to static spatial modulations in spin-singlet observables, while the SDW correlations remain dynamic: these are the `Friedel oscillations' of a spin-gap antiferromagnet. We connect the spectrum of these modulations as observed by scanning tunnelling microscopy to the dynamic spin structure factor measured by inelastic neutron scattering.
4 pages, 5 figure; (v2) modified abstract only to mention analogy with Friedel oscillations, which was also discussed in page 9 of cond-mat/0112343