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

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

preprint2014arXivOpen access
Y. J. UmYunkyu BangB. H. MinY. S. KwonM. Le Tacon
cond-mat.supr-concond-mat.str-el
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Y. J. UmYunkyu BangB. H. MinY. S. KwonM. Le Tacon

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