Effects of impurities and vortices on the low-energy spin excitations in high-Tc materials

Abstract

We review a theoretical scenario for the origin of the spin-glass phase of underdoped cuprate materials. In particular it is shown how disorder in a correlated d-wave superconductor generates a magnetic phase by inducing local droplets of antiferromagnetic order which eventually merge and form a quasi-long range ordered state. When correlations are sufficiently strong, disorder is unimportant for the generation of static magnetism but plays an additional role of pinning disordered stripe configurations. We calculate the spin excitations in a disordered spin-density wave phase, and show how disorder and/or applied magnetic fields lead to a slowing down of the dynamical spin fluctuations in agreement with neutron scattering and muon spin rotation (muSR) experiments.

arXiv comment4 pages, 3 figures, submitted for SNS2010 conference proceedings

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• Two routes to magnetic order by disorder in underdoped cuprates
• Magnetic field-enhanced spin freezing in YBa2Cu3O6.45 at the verge of the competition between superconductivity and charge order
• Electronic vortex structure of Fe-based superconductors: application to LiFeAs
• Disorder Induced Stripes in d-Wave Superconductors
• Competing superconducting and magnetic order parameters and field-induced magnetism in electron doped Ba(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$
• Field-induced inter-planar correlations in the high-temperature superconductor La1.88Sr0.12CuO4
• Nature of the magnetic stripes in fully oxygenated La${}_2$CuO${}_{4+y}$
• Pinning of stripes by local structural distortions in cuprate high-Tc superconductors
• Spin-glass state in nickelate superconductors