2008/10/15 by Y. Gallais, Yann Gallais, A. Sacuto +6 · 1 citation
Materials Science · Physics and Astronomy · #Iron-based superconductors research #cond-mat.str-el #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevb.78.132509
published as Phys. Rev. B 78, 132509 (2008) · 4 pages, 3 figures, to appear in Phys. Rev. B
arxiv created 2008/10/15 · openalex publication_date 2008/10/23 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
We report plane-polarized Raman-scattering spectra of iron oxypnictide superconductor NdFeAsO_1\ensuremath-xFx 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.