Three-Dimensional Electronic Structure of Superconducting Iron Pnictides Observed by Angle-Resolved Photoemission Spectroscopy

Walid Malaeb; Teppei Yoshida; Atsushi Fujimori; Masato Kubota; Kanta Ono; Kunihiro Kihou; Parasharam M. Shirage; Hijiri Kito; Akira Iyo; Hiroshi Eisaki; Yasuyuki Nakajima; Tsuyoshi Tamegai; Ryotaro Arita

doi:10.1143/jpsj.78.123706

Walid Malaeb, Teppei Yoshida, Atsushi Fujimori, Masato Kubota, Kanta Ono, Kunihiro Kihou, Parasharam M. Shirage, Hijiri Kito, Akira Iyo, Hiroshi Eisaki, Yasuyuki Nakajima, Tsuyoshi Tamegai, Ryotaro Arita

著者情報

Walid Malaeb
Department of Complexity Science and Engineering and Department of Physics, University of Tokyo
Teppei Yoshida
Department of Complexity Science and Engineering and Department of Physics, University of Tokyo
JST, Transformative Research-Project on Iron Pnictides (TRIP)
Atsushi Fujimori
Department of Complexity Science and Engineering and Department of Physics, University of Tokyo
Masato Kubota
Institute for Material Structure Science, High Energy Accelerator Research Organization
Kanta Ono
Institute for Material Structure Science, High Energy Accelerator Research Organization
Kunihiro Kihou
National Institute of Advanced Industrial Science and Technology (AIST)
Parasharam M. Shirage
National Institute of Advanced Industrial Science and Technology (AIST)
Hijiri Kito
National Institute of Advanced Industrial Science and Technology (AIST)
Akira Iyo
JST, Transformative Research-Project on Iron Pnictides (TRIP)
National Institute of Advanced Industrial Science and Technology (AIST)
Hiroshi Eisaki
JST, Transformative Research-Project on Iron Pnictides (TRIP)
National Institute of Advanced Industrial Science and Technology (AIST)
Yasuyuki Nakajima
JST, Transformative Research-Project on Iron Pnictides (TRIP)
Department of Applied Physics, University of Tokyo
Tsuyoshi Tamegai
JST, Transformative Research-Project on Iron Pnictides (TRIP)
Department of Applied Physics, University of Tokyo
Ryotaro Arita
JST, Transformative Research-Project on Iron Pnictides (TRIP)
Department of Applied Physics, University of Tokyo

キーワード: pnictides, three-dimensional electronic structure, ARPES

ジャーナル認証あり

2009 年 78 巻 12 号 p. 123706

DOI https://doi.org/10.1143/jpsj.78.123706

詳細

抄録

We have performed an angle-resolved photoemission spectroscopy (ARPES) study of the undoped and electron-doped iron pnictides BaFe_2−xCo_xAs₂ (Ba122) (x=0,0.14) and studied the Fermi surfaces (FSs) and band dispersions near the Fermi level. The FS sheets we observed are consistent with the shrinkage of the hole-like pockets around the Brillouin Zone (BZ) center and the expansion of the electron pockets around the BZ corner in the electron-doped compound as compared to the undoped parent compound. Band dispersions and FSs around the BZ center strongly depend on the photon energy, indicating a three-dimensional (3D) electronic structure. This observation suggests that antiferromagnetism and superconductivity in the pnictides have to be described in terms of an orbital-dependent 3D electronic structure, where FS nesting is not necessarily strong.

責任著者(Corresponding author)

J-STAGEへの登録はこちら（無料）