Sheet Dependence on Superconducting Gap in Oxygen-Deficient Iron-Based Oxypnictide Superconductors NdFeAsO_<0.85>(Condensed matter: electronic structure and electrical, magnetic, and optical properties)

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Photoemission spectroscopy with low-energy tunable photons on oxygen-deficient iron-based oxypnictide superconductors NdFeAsO_<0.85> (T_c=52K) reveals a distinct photon-energy dependence of the electronic structure near the Fermi level (E_F). A clear shift of the leading-edge can be observed in the superconducting states with 9.5eV photons, while a clear Fermi cutoff with little leading-edge shift can be observed with 6.0eV photons. The results are indicative of the superconducting gap opening not on the hole-like ones around Г(0,0) point but on the electron-like sheets around M(π,π) point.
社団法人日本物理学会の論文
2008-10-15