Structure of neutron-scattering peaks in both s++ -wave and s± -wave states of an iron pnictide superconductor

Seiichiro Onari, Hiroshi Kontani, Masatoshi Sato

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109 Citations (Scopus)

Abstract

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 γ due to strong electron-electron correlation: as the superconductivity develops, the reduction in γ 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.

Original languageEnglish
Article number060504
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume81
Issue number6
DOIs
Publication statusPublished - Feb 16 2010

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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