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We report a study of the lattice dynamics in superconducting NaFeAs (Tc = 8K) and doped NaFe0.97Co0.03As (Tc = 20 K) using Raman light scattering. Five ofthe six phonon modes expected from group theory are observed. In contrast withresults obtained on iso-structural and iso-electronic LiFeAs, anomalousbroadening of Eg(As) and A1g(Na) modes upon cooling is observed in bothsamples. In addition, in the Co-doped sample, a superconductivity-inducedrenormalization of the frequency and linewidth of the B1g(Fe) vibration isobserved. This renormalization can not be understood within a single band andsimple multi-band approaches. A theoretical model that includes the effects ofSDW correlations along with sign-changing s-wave pairing state and interbandscattering has been developed to explain the observed behavior of the B1g(Fe)mode.

Superconductivity-induced Phonon Renormalization on NaFe$_{1-x}$Co$_{x}$As