Magnetic and Quasiparticle Excitation Spectra of an Itinerant $J_1-J_2$ Model for Iron Pnictide Superconductors

Abstract

We calculate the magnetic and quasiparticle excitation spectra of an itinerant $J_1-J_2$ model for iron pnictides. In addition to an acoustic spin-wave branch, the magnetic spectrum has a second, optical branch, resulting from the coupled four-sublattice magnetic structure. The spin-wave velocity has also a planar directional anisotropy, due to the collinear/striped antiferromagnetism. Within the magnetically ordered phase, the quasiparticle spectrum is composed of two Dirac cones, resulting from the folding of the magnetic Brillouin zone. We discuss the relevance of our findings to the understanding of both neutron scattering and photoemission spectroscopy results for SrFe${}_2$As${}_2$.

4 pages, 3 figures, latex2e

References in corpus (15)

• Superconductivity at 38 K in the iron arsenide (Ba1-xKx)Fe2As2
• Magnetism, superconductivity, and pairing symmetry in Fe-based superconductors
• Theory of Electron Nematic Order in LaOFeAs
• A minimal two-band model for the superconducting Fe-pnictides
• Ising and Spin orders in Iron-based Superconductors
• Multiband magnetism and superconductivity in Fe-based compounds
• Origin of the spin density wave instability in AFe${}_2$As${}_2$ (A=Ba, Sr) as revealed by optical spectroscopy
• Nodal Spin Density Wave and band topology of the FeAs based materials
• Antiferromagnetic superexchange interactions in LaOFeAs
• Iron pnictides as a new setting for quantum criticality
• Low energy spin waves and magnetic interactions in SrFe${}_2$As${}_2$
• High energy spin excitations in BaFe2As2
• Theory of itinerant magnetic excitations in the SDW phase of iron-based superconductors
• Hall effect and magnetoresistance in single crystals of NdFeAsO${}_{1-x}$F${}_x$
• Magnetic Excitations in the High Tc Iron Pnictides

Cited by in corpus (3)

• Competing effective interactions of Dirac electrons in the Spin-Fermion system
• Magnon dispersion and Single hole motion in 2D frustrated antiferromagnets with four-sublattice structures
• Coarsening dynamics of Ising-nematic order in a frustrated Heisenberg antiferromagnet