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

M. Le Tacon, T. R. Forrest, Ch. Rüegg +10

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 b…