Theory of two magnon Raman scattering in antiferromagnetic iron pnictides

Abstract

Although the parent iron-based pnictides and chalcogenides are itinerant antiferromagnets, the use of local moment picture to understand their magnetic properties is still widespread. We study magnetic Raman scattering from a local moment perspective for various quantum spin models proposed for this new class of superconductors. These models vary greatly in the level of magnetic frustration and show a vastly different two-magnon Raman response. Light scattering by two-magnon excitations thus provides a robust and independent measure of the underlying spin interactions. In accord with other recent experiments, our results indicate that the amount of magnetic frustration in these systems may be small.

arXiv commentOriginal: 4+ pages, 4 figures. Replaced: 4+ pages, 4 figure with revised title and content

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• Theory of inelastic light scattering in spin-1 systems: resonant regimes and detection of quadrupolar order
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• Probing high-energy electronic excitations using inelastic neutron scattering
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• Paradeisos: a perfect hashing algorithm for many-body eigenvalue problems
• Spin-Density-Wave Gap with Dirac Nodes and Two-Magnon Raman Scattering in BaFe2As2
• Raman scattering in a Heisenberg S=1/2 antiferromagnet on the anisotropic triangular lattice
• Magnetic excitations and amplitude fluctuations in insulating cuprates
• Theory of Time-Resolved Raman Scattering in Correlated Systems: Ultrafast Engineering of Spin Dynamics and Detection of Thermalization
• Frustrated Magnetism from Local Moments in FeSe
• Spectrum splitting of bimagnon excitations in a spatially frustrated Heisenberg antiferromagnet revealed by resonant inelastic x-ray scattering
• Raman scattering study of lattice and magnetic excitations in CrAs
• Fluctuations and pairing in Fe-based superconductors: Light scattering experiments
• Magnon-phonon coupling effects on the indirect K-edge resonant inelastic X-ray scattering spectrum of a 2D Heisenberg antiferromagnet
• Temperature-induced Change in the Fermi Surface Topology in the Spin Density Wave Phase of Sr(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$
• Potential of Raman scattering in probing magnetic excitations and their coupling to lattice dynamics
• Signatures of multiple charge excitations in RIXS spectra of metals
• Spin wave approach to the two-magnon Raman scattering in an J1x-J1y-J2-Jc antiferromagnetic Heisenberg model