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

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.

preprint2010arXivOpen access
M. Le TaconT. R. ForrestCh. RüeggA. BosakJ. NoffsingerA. C. WaltersP. ToulemondeA. PalenzonaN. D. ZhigadloJ. KarpinskiJ. P. HillM. KrischD. F. McMorrow
cond-mat.supr-concond-mat.str-el
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Open access13 authors2 topics
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M. Le TaconT. R. ForrestCh. RüeggA. BosakJ. NoffsingerA. C. WaltersP. ToulemondeA. PalenzonaN. D. ZhigadloJ. KarpinskiJ. P. HillM. KrischD. F. McMorrow

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