Inelastic x-ray scattering investigations of lattice dynamics in SmFeAsO${}_{1-x}$F${}_y$ superconductors

Abstract

We report measurements of the phonon density of states as measured with inelastic x-ray scattering in SmFeAsO${}_{1-x}$F${}_y$ powders. An unexpected strong renormalization of phonon branches around 23 meV is observed as fluorine is substituted for oxygen. Phonon dispersion measurements on SmFeAsO${}_{1-x}$F${}_y$ single crystals allow us to identify the 21 meV A${}_{1g}$ in-phase (Sm,As) and the 26 meV B${}_{1g}$ (Fe,O) modes to be responsible for this renormalization, and may reveal unusual electron-phonon coupling through the spin channel in iron-based superconductors.

4 pages, 3 figures, submitted for SNS2010 conference proceedings

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