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The quasiparticle states around a nonmagnetic impurity in electron-dopediron-based superconductors with spin-density-wave (SDW) order are investigatedas a function of doping and impurity scattering strength. In the undopedsample, where a pure SDW state exists, two impurity-induced resonance peaks areobserved around the impurity site and they are shifted to higher (lower)energies as the strength of the positive (negative) scattering potential (SP)is increased. For the doped samples where the SDW order and the superconductingorder coexist, the main feature is the existence of sharp in-gap resonancepeaks whose positions and intensity depend on the strength of the SP and thedoping concentration. In all cases, the local density of states exhibits clear$C_2$ symmetry. We also note that in the doped cases, the impurity will dividethe system into two sublattices with distinct values of magnetic order. Here weuse the band structure of a two-orbital model, which considers the asymmetry ofthe As atoms above and below the Fe-Fe plane. This model is suitable to studythe properties of the surface layers in the iron-pnictides and should be moreappropriate to describe the scanning tunneling microscopy experiments.

Quasiparticle states around a nonmagnetic impurity in electron-doped iron-based superconductors with spin-density-wave order