Physics – Condensed Matter – Superconductivity
Scientific paper
2009-10-19
Phys. Rev. B 81, 060504(R) (2010)
Physics
Condensed Matter
Superconductivity
5 pages, 4 figures, to be published in Phys. Rev. B (Rapid Communication)
Scientific paper
10.1103/PhysRevB.81.060504
We study the neutron scattering spectrum in iron pnictides based on the random-phase approximation in the five-orbital model, for fully-gapped s-wave states with sign reversal (s+-) and without sign reversal (s++). In the s++ wave state, we find that a prominent hump structure appears just above the spectral gap, by taking account of the quasiparticle damping gamma due to strong electron-electron correlation: As the superconductivity develops, the reduction in gamma gives rise to the large overshoot in the spectrum above the gap. 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 is much larger. In the present study, experimentally observed broad spectral peak in iron pnictides is naturally reproduced by assuming the s++ wave state.
Kontani Hiroshi
Onari Seiichiro
Sato* Masatoshi
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