Physics – Condensed Matter – Superconductivity
Scientific paper
2009-10-06
Phys. Rev. B 80, 180510(R) (2009) [see also Physics 2, 100 (2009)]
Physics
Condensed Matter
Superconductivity
5 pages, 4 figures
Scientific paper
We present details of carrier properties in high quality ${\rm Ba(Fe_{1-x}Co_{x})_2As_2}$ single crystals obtained from electronic Raman scattering. The experiments indicate a strong band and momentum anisotropy of the electron dynamics above and below the superconducting transition highlighting the importance of complex band-dependent interactions. The presence of low energy spectral weight deep in the superconducting state suggests a gap with accidental nodes which may be lifted by doping and/or impurity scattering. When combined with other measurements, our observation of band and momentum dependent carrier dynamics indicate that the iron arsenides may have several competing superconducting ground states.
Analytis James G.
Chu Jiun-Haw.
Devereaux Thomas P.
Fisher Ian R.
Hackl Rudi
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