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Superconductivity-induced phonon renormalization on NaFe1-xCoxAs

Title
Superconductivity-induced phonon renormalization on NaFe1-xCoxAs
Authors
Um, YJ[Um, Y. J.]Bang, Y[Bang, Yunkyu]Min, BH[Min, B. H.]Kwon, YS[Kwon, Y. S.]Le Tacon, M[Le Tacon, M.]
DGIST Authors
Min, BH[Min, B. H.]; Kwon, YS[Kwon, Y. S.]
Issue Date
2014-05-19
Citation
Physical Review B: Condensed Matter and Materials Physics, 89(18)
Type
Article
Article Type
Article
ISSN
1098-0121
Abstract
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 isostructural and isoelectronic 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 cannot be understood within a single band and simple multiband approaches. A theoretical model that includes the effects of spin-density wave 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. © 2014 American Physical Society.
URI
http://hdl.handle.net/20.500.11750/2391
DOI
10.1103/PhysRevB.89.184510
Publisher
American Physical Society
Files:
There are no files associated with this item.
Collection:
Emerging Materials ScienceQuantum Functional Materials Laboratory1. Journal Articles


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