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Phys. Rev. B 78, 184514 (2008) [6 pages]

Fermi surface and band renormalization of Sr1−xKxFe2As2 from angle-resolved photoemission spectroscopy

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Haiyun Liu1, Wentao Zhang1, Lin Zhao1, Xiaowen Jia1, Jianqiao Meng1, Guodong Liu1, Xiaoli Dong1, G. F. Chen2, J. L. Luo2, N. L. Wang2, Wei Lu1, Guiling Wang3, Yong Zhou3, Yong Zhu4, Xiaoyang Wang4, Zuyan Xu3, Chuangtian Chen4, and X. J. Zhou1,*
1National Laboratory for Superconductivity, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
2Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
3Key Laboratory for Optics, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
4Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China

Received 20 July 2008; revised 10 October 2008; published 19 November 2008

High-resolution angle-resolved photoemission measurements have been carried out on the (Sr,K)Fe2As2 superconductor (Tc=21 K). Three holelike Fermi-surface sheets are resolved around the Γ point. One electronlike Fermi surface and strong Fermi spots are observed near the M(π,π) point which are different from a round electron pocket expected from band calculations. This discrepancy and the observed band renormalization ask for further theoretical effort in understanding the electronic structure of the Fe-based compounds.

© 2008 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.78.184514
DOI:
10.1103/PhysRevB.78.184514
PACS:
74.70.−b, 71.20.−b, 74.25.Jb, 79.60.−i

*xjzhou@aphy.iphy.ac.cn

 
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