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

Y. Gallais, A. Sacuto, M. Cazayous +3

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 sh…