Magnetic Excitations in the High Tc Iron Pnictides

Abstract

We calculate the expected finite frequency neutron scattering intensity based on the two-sublattice collinear antiferromagnet found by recent neutron scattering experiments as well as by theoretical analysis on the iron oxypnictide LaOFeAs. We consider two types of superexchange couplings between Fe atoms: nearest-neighbor coupling J1 and next-nearest-neighbor coupling J2. We show how to distinguish experimentally between ferromagnetic and antiferromagnetic J1. Whereas magnetic excitations in the cuprates display a so-called resonance peak at (pi,pi) (corresponding to a saddlepoint in the magnetic spectrum) which is at a wavevector that is at least close to nesting Fermi-surface-like structures, no such corresponding excitations exist in the iron pnictides. Rather, we find saddlepoints near (pi,pi/2) and (0,pi/2)(and symmetry related points). Unlike in the cuprates, none of these vectors are close to nesting the Fermi surfaces.

4 pages, 5 figures

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• Effects of ring exchange interaction on the Neel phase of two-dimensional, spatially anisotropic, frustrated Heisenberg quantum antiferromagnet
• Inelastic Neutron Scattering Studies of the Spin and Lattice Dynamics in Iron Arsenide Compounds
• Spin and quadrupolar orders in the spin-1 bilinear-biquadratic model for iron-based superconductors
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• Magnetic Excitations of Undoped Iron Oxypnictides
• Magnetic phase diagram of spatially anisotropic, frustrated spin-1/2 Heisenberg antiferromagnet on a stacked square lattice
• The double life of electrons in magnetic iron pnictides, as revealed by NMR
• Spectrum splitting of bimagnon excitations in a spatially frustrated Heisenberg antiferromagnet revealed by resonant inelastic x-ray scattering
• Magnon-phonon coupling effects on the indirect K-edge resonant inelastic X-ray scattering spectrum of a 2D Heisenberg antiferromagnet
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• Spin waves in the (0,pi) and (0,pi,pi) ordered SDW states of the t-t' Hubbard model: Application to doped iron pnictides
• Magnetic and Quasiparticle Excitation Spectra of an Itinerant $J_1-J_2$ Model for Iron Pnictide Superconductors
• Electronic structure, spin excitations, and orbital ordering in a three-orbital model for iron pnictides
• Temperature-dependent striped antiferromagnetism of LaFeAsO in a Green's function approach
• Spin-wave excitations in the SDW state of iron pnictides: a comparison between the roles of interaction parameters
• Spin-wave excitations in the SDW state of doped iron pnictides
• Magnon dispersion and Single hole motion in 2D frustrated antiferromagnets with four-sublattice structures
• Two-orbital quantum spin model of magnetism in the iron pnictides