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We study the neutron scattering spectrum in iron pnictides based on therandom-phase approximation in the five-orbital model, for fully-gapped s-wavestates with sign reversal (s+-) and without sign reversal (s++). In the s++wave state, we find that a prominent hump structure appears just above thespectral gap, by taking account of the quasiparticle damping gamma due tostrong electron-electron correlation: As the superconductivity develops, thereduction in gamma gives rise to the large overshoot in the spectrum above thegap. The obtained hump structure looks similar to the resonance peak in the s+-wave state, although the height and weight of the peak in the latter state ismuch larger. In the present study, experimentally observed broad spectral peakin iron pnictides is naturally reproduced by assuming the s++ wave state.

Structure of Neutron-Scattering Peak in both s++ wave and s+- wave states of an Iron pnictide Superconductor