Physics – Condensed Matter – Superconductivity
Scientific paper
2008-10-15
Phys. Rev. B 78, 132509 (2008)
Physics
Condensed Matter
Superconductivity
4 pages, 3 figures, to appear in Phys. Rev. B
Scientific paper
10.1103/PhysRevB.78.132509
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 sharp and symmetrical phonon lines with a weak dependence on fluorine doping $x$. The temperature dependence does not show any phonon anomaly at the superconducting transition. The Fe related phonon intensity shows a strong resonant enhancement below 2 eV. We associate the resonant enhancement to the presence of an interband transition around 2 eV observed in optical conductivity. Our results point to a rather weak coupling between Raman-active phonons and electronic excitations in iron oxypnictides superconductors.
Cazayous M.
Cheng Peiling
Fang Lujun
Gallais Yann
Sacuto A.
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