Temperature dependence and resonance effects in Raman scattering of phonons in NdFeAsO${}_x$F${}_{1-x}$ single crystals

Abstract

We report plane-polarized Raman scattering spectra of iron oxypnictide superconductor NdFeAsO${}_{1-x}$F${}_x$ single crystals with varying fluorine $x$ content. The spectra exhibit sharp and symmetrical phonon lines with a weak dependence on fluorine doping $x$. The temperature dependence does not show any phonon anomaly at the superconducting transition. The Fe related phonon intensity shows a strong resonant enhancement below 2 eV. We associate the resonant enhancement to the presence of an interband transition around 2 eV observed in optical conductivity. Our results point to a rather weak coupling between Raman-active phonons and electronic excitations in iron oxypnictides superconductors.

arXiv comment4 pages, 3 figures, to appear in Phys. Rev. B

References in corpus (14)

• Magnetic Order versus superconductivity in the Iron-based layered La(O1-xFx)FeAs systems
• LaFeAsO${}_{1-x}$F${}_x$: A low carrier density superconductor near itinerant magnetism
• Observation of Fermi-surface-dependent nodeless superconducting gaps in Ba0.6K0.4Fe2As2
• Is LaO${}_{1-x}$F${}_x$FeAs an electron-phonon superconductor ?
• Correlated electronic structure of LaOFeAs
• Momentum dependence of the superconducting gap in NdFeAsO1-xFx single crystals measured by angle resolved photoemission spectroscopy
• Bandwidth and Fermi surface of Iron-Oxypnictides: covalency and sensitivity to structural changes
• Critical Fields and Anisotropy of NdO0.82F0.18FeAs Single Crystals
• Pressure-induced superconductivity in single crystal CaFe2As2
• Magnetic Order of the Iron Spins in NdOFeAs
• Raman scattering study of (K${}_x$Sr${}_{1-x}$)Fe${}_2$As${}_2$ ($x$ = 0.0, 0.4)
• Physical origin of the buckling in CuO${}_2$: Electron-phonon coupling and Raman spectra
• Phonon Density of States in Nd(O${}_{1-x}$F${}_x$)FeAs
• Hole concentration and phonon renormalization in Ca-doped YBa_2Cu_3O_y (6.76 < y < 7.00)

Cited by in corpus (21)

• FeAs-based superconductivity: a case study of the effects of transition metal doping on BaFe2As2
• Doping dependence of the lattice dynamics in Ba(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$ studied by Raman spectroscopy
• Anomalous Raman scattering from phonons and electrons of superconducting FeSe${}_{0.82}$
• Optical and Raman spectroscopy studies on Fe-based superconductors
• Electron-Phonon Properties of Pnictide Superconductors
• Electron-phonon coupling in cuprate and iron-based superconductors revealed by Raman scattering
• 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${}_x$
• Doping and Temperature Dependence of Raman Scattering of NdFeAsO1-xFx (x=0.0, 0.1, 0.2) Superconductor
• Raman Scattering Study of the Lattice Dynamics of Superconducting LiFeAs
• Soft and Isotropic Phonons in PrFeAsO_{1-y}
• Anharmonic softening of Raman active phonons in Iron-Pnictides; estimating the Fe isotope effect due to anharmonic expansion
• Temperature dependent local structure of NdFeAsO1-xFx system using arsenic K-edge extended x-ray absorption fine structure
• Temperature-dependent Raman study of CeFeAsO0.9F0.1 Superconductor: Crystal field excitations, phonons and their coupling
• Coupling of the A_{1g} As-phonon to magnetism in iron pnictides
• Raman Evidence for Superconducting Gap and Spin-Phonon Coupling in Superconductor Ca(Fe0.95Co0.05)2As2
• Superconducting Fluctuations and Anomalous Phonon Renormalization much above superconducting transition temperature in Ca4Al2O5.7Fe2As2
• Raman scattering in iron-based superconductors
• Superconductivity-induced Phonon Renormalization on NaFe${}_{1-x}$Co${}_x$As
• Raman scattering investigation of superconducting Ba${}_2$Ti${}_2$Fe${}_2$As${}_4$O
• Small influence of magnetic ordering on lattice dynamics in TaFe${}_{1.25}$Te${}_3$
• Non-linear lattice response of SmFeAsO_{1-x}F_{x} superconductor to hydrostatic pressure