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Neutron scattering study of the oxypnictide superconductor La(O,F)FeAs

  • Qiu, Y.
  • Kofu, M.
  • Bao, Wei
  • Lee, S. -H.
  • Huang, Q.
  • Yildirim, T.
  • Copley, J. R. D.
  • Lynn, J. W.
  • Wu, T.
  • Wu, G.
  • Chen, X. H.
Published Article
Publication Date
May 07, 2008
Submission Date
May 07, 2008
DOI: 10.1103/PhysRevB.78.052508
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The newly discovered superconductor La(O,F)FeAs (Tc = 26 K) was investigated using the neutron scattering technique. No spin-density-wave (SDW) order was observed in the normal state nor in the superconducting state, both with and without an applied magnetic field of 9 T, consistent with the proposal that SDW and superconductivity are competing in the laminar materials. While our inelastic measurements offer no constraints on the spin dynamic response from d-wave pairing, an upper limit for the magnetic resonance peak predicted from an extended s-wave pairing mechanism is provided. Our measurements also support the energy scale of the calculated phonon spectrum which is used in electron-phonon coupling theory, and fails to produce the high observed Tc.

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