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Sheet Dependence on Superconducting Gap in Oxygen-Deficient Iron-Based Oxypnictide Superconductors NdFeAsO 0.85

2008; Physical Society of Japan; Volume: 77; Issue: 10 Linguagem: Inglês

10.1143/jpsj.77.103712

1347-4073

Y. Aiura, K. Satô, Hideaki Iwasawa, Y. Nakashima, H. Anzai, A. Ino, Masashi Arita, K. Shimada, H. Namatame, M. Taniguchi, Izumi Hase, Kiichi Miyazawa, Parasharam M. Shirage, Hiroshi Eisaki, H. Kitô, Akira Iyo,

Intellectual Capital and Performance Analysis

Photoemission spectroscopy with low-energy tunable photons on oxygen-deficient iron-based oxypnictide superconductors NdFeAsO 0.85 ( T c =52 K) 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 9.5 eV photons, while a clear Fermi cutoff with little leading-edge shift can be observed with 6.0 eV photons. The results are indicative of the superconducting gap opening not on the hole-like ones around Γ(0,0) point but on the electron-like sheets around M(π,π) point.