Sheet Dependence on Superconducting Gap in Oxygen-Deficient Iron-based Oxypnictide Superconductors NdFeAs0.85

Yoshihiro Aiura; Koji Sato; Hideaki Iwasawa; Yosuke Nakashima; Akihiro Ino; Masashi Arita; Kenya Shimada; Hirofumi Namatame; Masaki Taniguchi; Izumi Hase; Kiichi Miyazawa; Parasharam M. Shirage; Hiroshi Eisaki; Hijiri Kito; Akira Iyo

doi:10.1143/JPSJ.77.103712

Sheet Dependence on Superconducting Gap in Oxygen-Deficient Iron-based Oxypnictide Superconductors NdFeAs0.85

Superconductivity 2009-11-13 v1

Authors: Yoshihiro Aiura , Koji Sato , Hideaki Iwasawa , Yosuke Nakashima , Akihiro Ino , Masashi Arita , Kenya Shimada , Hirofumi Namatame , Masaki Taniguchi , Izumi Hase , Kiichi Miyazawa , Parasharam M. Shirage , Hiroshi Eisaki , Hijiri Kito , Akira Iyo

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Abstract

Photoemission spectroscopy with low-energy tunable photons on oxygen-deficient iron-based oxypnictide superconductors NdFeAsO0.85 (Tc=52K) reveals a distinct photon-energy dependence of the electronic structure near the Fermi level (EF). 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 Gamma (0,0) point but on the electron-like sheets around M(pi,pi) point.

Keywords

iron-based superconductor superconducting gap photoemission spectroscopy oxygen-deficient oxypnictide electronic structure Fermi level

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@article{arxiv.0808.1063,
  title  = {Sheet Dependence on Superconducting Gap in Oxygen-Deficient Iron-based Oxypnictide Superconductors NdFeAs0.85},
  author = {Yoshihiro Aiura and Koji Sato and Hideaki Iwasawa and Yosuke Nakashima and Akihiro Ino and Masashi Arita and Kenya Shimada and Hirofumi Namatame and Masaki Taniguchi and Izumi Hase and Kiichi Miyazawa and Parasharam M. Shirage and Hiroshi Eisaki and Hijiri Kito and Akira Iyo},
  journal= {arXiv preprint arXiv:0808.1063},
  year   = {2009}
}

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8 pages, 3 figures

Sheet Dependence on Superconducting Gap in Oxygen-Deficient Iron-based Oxypnictide Superconductors NdFeAs0.85

Abstract

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