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We investigate the spin-wave excitations in the spin-density wave state of doped iron pnictides within a five-orbital model. We find that the excitations along ($pi, 0$)$rightarrow$($pi, pi$) are very sensitive to the doping whereas they do not exhibit a similar sensitivity along ($0, 0$) $rightarrow$ ($pi, 0$). Secondly, anisotropy in the excitations around ($pi, 0$) with an elliptical shape grows on moving towards the hole-doped region for low energy, whereas it decreases for the high-energy excitations on the contrary. Thirdly, spin-wave spectral weight shifts towards the low-energy region on moving away from zero doping. We find these features to be in qualitative agreement with the inelastic neutron-scattering measurements for the doped pnictides.
We investigate the role of Hunds coupling in the spin-wave excitations of the ($pi, 0$) ordered magnetic state within a five-orbital tight-binding model for iron pnictides. To differentiate between the roles of intraorbital Coulomb interaction and Hu
We investigate the impurity scattering induced quasiparticle interference in the ($pi, 0$) spin-density wave phase of the iron pnictides. We use a five orbital tight binding model and our mean field theory in the clean limit captures key features of
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 consid
We study a two-orbital spin model to describe (pi,0) stripe antiferromagnetism in the iron pnictides. The double-spin model has an on-site Hundss coupling and inter-site interactions extending to second neighbors (inter- and intra-orbital) on the squ
We employ the phenomenological theory of the quasiparticle relaxation based on the simplified two-band description and the spin-fluctuation induced interband coupling to analyze recent normal-state transport data in electron-doped iron pnictides, in