Journal
PHYSICAL REVIEW B
Volume 81, Issue 6, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.81.060504
Keywords
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Funding
- MEXT of Japan
- JST
- TRIP
- Grants-in-Aid for Scientific Research [22740222] Funding Source: KAKEN
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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.
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