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Fermi Surface and Band Renormalization in (Sr,K)Fe$_2$As$_2$ Superconductor from Angle-Resolved Photoemission Spectroscopy

Superconductivity 2008-11-20 v2 Strongly Correlated Electrons
Authors: Haiyun Liu , Wentao Zhang , Lin Zhao , Xiaowen Jia , Jianqiao Meng , Guodong Liu , Xiaoli Dong , G. F. Chen , J. L. Luo , N. L. Wang , Wei Lu , Guiling Wang , Yong Zhou , Yong Zhu , Xiaoyang Wang , Zhongxian Zhao , Zuyan Xu , Chuangtian Chen , X. J. Zhou
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Abstract

High resolution angle-resolved photoemission measurements have been carried out on (Sr,K)Fe2_2As2_2 superconductor (Tc=21 K). Three hole-like Fermi surface sheets are clearly resolved for the first time around the Gamma point. The overall electronic structure shows significant difference from the band structure calculations. Qualitative agreement between the measured and calculated band structure is realized by assuming a chemical potential shift of -0.2 eV. The obvious band renormalization suggests the importance of electron correlation in understanding the electronic structure of the Fe-based compounds.

Keywords

Fe-based superconductor (Sr,K)Fe$_2$As$_2$ angle-resolved photoemission spectroscopy Fermi surface band renormalization electron correlation

Cite

@article{arxiv.0806.4806,
  title  = {Fermi Surface and Band Renormalization in (Sr,K)Fe$_2$As$_2$ Superconductor from Angle-Resolved Photoemission Spectroscopy},
  author = {Haiyun Liu and Wentao Zhang and Lin Zhao and Xiaowen Jia and Jianqiao Meng and Guodong Liu and Xiaoli Dong and G. F. Chen and J. L. Luo and N. L. Wang and Wei Lu and Guiling Wang and Yong Zhou and Yong Zhu and Xiaoyang Wang and Zhongxian Zhao and Zuyan Xu and Chuangtian Chen and X. J. Zhou},
  journal= {arXiv preprint arXiv:0806.4806},
  year   = {2008}
}

Comments

4 pages, 4 figures

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