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Publication Detail
Inelastic x-ray scattering study of superconducting SmFeAsO1-xFy single crystals: Evidence for strong momentum-dependent doping-induced renormalizations of optical phonons
  • Publication Type:
    Journal article
  • Publication Sub Type:
    Article
  • Authors:
    Le Tacon M, Forrest TR, Ruegg C, Bosak A, Walters AC, Mittal R, Ronnow HM, Zhigadlo ND, Katrych S, Karpinski J, Hill JP, Krisch M, McMorrow DF
  • Publisher:
    AMER PHYSICAL SOC
  • Publication date:
    12/2009
  • Journal:
    PHYS REV B
  • Volume:
    80
  • Issue:
    22
  • Print ISSN:
    1098-0121
  • Language:
    EN
  • Keywords:
    doping, fluorine, iron compounds, lattice dynamics, phonon dispersion relations, samarium compounds, superconducting materials, X-ray scattering, IRON, COMPOUND
  • Addresses:
    Le Tacon, M
    European Synchrotron Radiat Facil
    F-38043
    Grenoble
    France

    UCL
    Dept Phys & Astron
    London
    WC1E 6BT
    England
Abstract
We report inelastic x-ray scattering experiments on the lattice dynamics in SmFeAsO and superconducting SmFeAsO0.60F0.35 single crystals. Particular attention was paid to the dispersions along the [100] direction of three optical modes close to 23 meV, polarized out of the FeAs planes. Remarkably, two of these modes are strongly renormalized upon fluorine doping. These results provide significant insight into the energy and momentum dependence of the coupling of the lattice to the electron system and underline the importance of spin-phonon coupling in the superconducting iron pnictides.
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