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

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