Sheet Dependence on Superconducting Gap in Oxygen-Deficient Iron-Based Oxypnictide Superconductors NdFeAsO0.85

• DOI: 10.1143/jpsj.77.103712
• Publication Date: 2008-10-10T03:49:28Z
• Authors: Yoshihiro Aiura; Koji Sato; Hideaki Iwasawa; Yosuke Nakashima; Hiroaki Anzai; Akihiro Ino; Masashi Arita; Kenya Shimada; Hirofumi Namatame; Masaki Taniguchi; Izumi Hase; Kiichi Miyazawa; Parasharam M. Shi...; Hiroshi Eisaki; Hijiri Kito; Akira Iyo
• Keywords: Photon energy

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 Fermi level E F ). A clear shift leading-edge can be observed in superconducting states 9.5 eV photons, while cutoff little 6.0 photons. The results are indicative gap opening not hole-like ones around Γ(0,0) point but electron-like sheets M(π,π) point.