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

Seiichiro Onari, Hiroshi Kontani, Masatoshi Sato

Research output: Contribution to journalArticle

108 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
Externally publishedYes

Fingerprint

Group 5A compounds
Neutron scattering
Superconducting materials
neutron scattering
Iron
iron
Electron correlations
Superconductivity
electrons
superconductivity
Damping
damping
orbitals
Electrons
approximation

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials

Cite this

Structure of neutron-scattering peaks in both s++ -wave and s± -wave states of an iron pnictide superconductor. / Onari, Seiichiro; Kontani, Hiroshi; Sato, Masatoshi.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 81, No. 6, 060504, 16.02.2010.

Research output: Contribution to journalArticle

@article{40a16382588940fd828a0ba58c2748f5,
title = "Structure of neutron-scattering peaks in both s++ -wave and s± -wave states of an iron pnictide superconductor",
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.",
author = "Seiichiro Onari and Hiroshi Kontani and Masatoshi Sato",
year = "2010",
month = "2",
day = "16",
doi = "10.1103/PhysRevB.81.060504",
language = "English",
volume = "81",
journal = "Physical Review B-Condensed Matter",
issn = "1098-0121",
publisher = "American Physical Society",
number = "6",

}

TY - JOUR

T1 - Structure of neutron-scattering peaks in both s++ -wave and s± -wave states of an iron pnictide superconductor

AU - Onari, Seiichiro

AU - Kontani, Hiroshi

AU - Sato, Masatoshi

PY - 2010/2/16

Y1 - 2010/2/16

N2 - 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.

AB - 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.

UR - http://www.scopus.com/inward/record.url?scp=77954822227&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=77954822227&partnerID=8YFLogxK

U2 - 10.1103/PhysRevB.81.060504

DO - 10.1103/PhysRevB.81.060504

M3 - Article

AN - SCOPUS:77954822227

VL - 81

JO - Physical Review B-Condensed Matter

JF - Physical Review B-Condensed Matter

SN - 1098-0121

IS - 6

M1 - 060504

ER -