Inelastic X-ray Scattering Study of superconducting SmFeAs(O${}_{1-x}$F${}_y$) Single Crystals: Evidence for Strong Momentum-Dependent Doping-Induced Renormalizations of Optical Phonons

Abstract

We report inelastic x-ray scattering experiments on the lattice dynamics in SmFeAsO and superconducting SmFeAsO${}_{0.6}$F${}_{0.35}$ 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.

accepted version

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Cited by in corpus (19)

• Interplay of magnetic and structural transitions in Fe-based pnictide superconductors
• Magnetic interactions in iron superconductors: A review
• A perspective on pnictide superconductors
• Raman scattering study of Spin-Density-Wave order and electron-phonon coupling in Ba(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$
• Anomalous dependence of the c-axis polarized Fe B${}_{1g}$ phonon mode with Fe and Se concentrations in Fe${}_{1+y}$Te${}_{1-x}$Se${}_x$
• Interplay of composition, structure, magnetism, and superconductivity in SmFeAs1-xPxO1-y
• Temperature and Pressure Dependence of the Fe-specific Phonon Density of States in Ba(Fe(1-x)Co(x))2As2
• Magnetic Lattice Dynamics of the Oxygen-Free FeAs Pnictides: How Sensitive are Phonons to Magnetic Ordering?
• Raman Scattering Study of the Lattice Dynamics of Superconducting LiFeAs
• Soft and Isotropic Phonons in PrFeAsO_{1-y}
• Spin-Lattice Coupling in K0.8Fe1.6Se2 and KFe2Se2: Inelastic Neutron Scattering and ab-initio Phonon Calculations
• Spin dependent electron-phonon interaction in SmFeAsO by low-temperature Raman spectroscopy
• Introduction to High-Resolution Inelastic X-Ray Scattering
• Electron-phonon interaction in Fe-based superconductors: Coupling of magnetic moments with phonons in LaFeAsO${}_{1-x}$F${}_x$
• Coupling of the A_{1g} As-phonon to magnetism in iron pnictides
• Magnetism dependent phonon anomaly in LaFeAsO observed via inelastic x-ray scattering
• Superconductivity-induced Phonon Renormalization on NaFe${}_{1-x}$Co${}_x$As
• Inelastic x-ray scattering investigations of lattice dynamics in SmFeAsO${}_{1-x}$F${}_y$ superconductors
• Inelastic neutron and x-ray scattering as probes of the sign structure of the Fe-pnictide superconducting gap