Spin dynamics in electron-doped pnictide superconductors

Abstract

The doping dependence of spin excitations in Ba(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$ is studied based on a two-orbital model under RPA approximation. The interplay between the spin-density-wave (SDW) and superconductivity (SC) is considered in our calculation. Our results for the spin susceptibility are in good agreement with neutron scattering (NS) experiments in various doping ranges at temperatures (T) above and below the superconducting transition temperature T${}_c$. For the overdoped sample where one of the two hole pockets around $\Gamma$ point disappears according to ARPES, we show that the imaginary part of the spin susceptibility in both SC and normal phases exhibits a gap-like behavior. This feature is consistent with the "pseudogap" as observed by recent NMR and NS experiments.

5 pages, 2 figures

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• Two energy scales in the magnetic resonance spectrum of electron and hole doped pnictide superconductors
• Quasiparticle states around a nonmagnetic impurity in electron-doped iron-based superconductors with spin-density-wave order
• Spin excitations in nickelate superconductors
• Impurity-induced quasiparticle interference in the parent compounds of iron-pnictide superconductors
• Consistent picture for the electronic structure around a vortex core in iron-based superconductors
• Possible spin excitation structure in monolayer FeSe grown on SrTiO${}_3$
• Superfluid density in the $s_{\pm }$-wave state of clean iron-based superconductors
• Tunneling interstitial impurity in iron-chalcogenide based superconductors
• Competing magnetic states on the surface of multilayer ABC-stacked graphene
• Theory of Mixed-State Effect on Quasiparticle Interference in Iron-based Superconductors
• Fermi surface evolution and checker-board block-spin antiferromagnetism in $A_x$Fe${}_{2-y}$Se${}_2$
• Metal-insulator transition and superconductivity in the two-orbital Hubbard-Holstein model for iron-based superconductors
• Robust $s_{\pm }$-wave superconductivity against multi-impurity in iron-based superconductors