Unusual electronic structure and observation of dispersion kink in CeFeAsO parent compound of FeAs-based superconductors.
We report the first comprehensive high-resolution angle-resolved photoemission measurements on CeFeAsO, a parent compound of FeAs-based high temperature superconductors with a magnetic-structural transition at ∼150 K. In the magnetic-ordering state, four holelike Fermi surface sheets are observed near Γ(0,0), and the Fermi surface near M(±π,±π) shows a tiny electronlike pocket at M surrounded by four strong spots. The unusual Fermi surface topology deviates strongly from the band structure calculations. The electronic signature of the magnetic-structural transition shows up in the dramatic change of the quasiparticle scattering rate. A dispersion kink at ∼25 meV is observed for the first time in the parent compound of Fe-based superconductors.
Liu
Haiyun
H
National Lab for Superconductivity, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.
Chen
G F
GF
Zhang
Wentao
W
Zhao
Lin
L
Liu
Guodong
G
Xia
T-L
TL
Jia
Xiaowen
X
Mu
Daixiang
D
Liu
Shanyu
S
He
Shaolong
S
Peng
Yingying
Y
He
Junfeng
J
Chen
Zhaoyu
Z
Dong
Xiaoli
X
Zhang
Jun
J
Wang
Guiling
G
Zhu
Yong
Y
Xu
Zuyan
Z
Chen
Chuangtian
C
Zhou
X J
XJ