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arxiv: 1005.4165 · v1 · pith:3KAJCKKCnew · submitted 2010-05-23 · ❄️ cond-mat.supr-con · cond-mat.str-el

Inelastic x-ray scattering investigations of lattice dynamics in SmFeAsO_(1-x)F_y superconductors

M. Le Tacon , T. R. Forrest , Ch. R\"uegg , A. Bosak , J. Noffsinger , A. C. Walters , P. Toulemonde , A. Palenzona
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N. D. Zhigadlo J. Karpinski J. P. Hill M. Krisch D.F. McMorrow
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classification ❄️ cond-mat.supr-con cond-mat.str-el
keywords phononsmfeasoinelasticmeasurementsrenormalizationscatteringsuperconductorsx-ray
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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.

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