Absence of a Holelike Fermi Surface for the Iron-Based K0.8Fe1.7Se2 Superconductor Revealed by Angle-Resolved Photoemission Spectroscopy

T. Qian, X.-P. Wang, W.-C. Jin, P. Zhang, P. Richard, G. Xu, X. Dai, Z. Fang, J.-G. Guo, X.-L. Chen, and H. Ding
Phys. Rev. Lett. 106, 187001 – Published 3 May 2011

Abstract

We have performed an angle-resolved photoemission spectroscopy study of the new iron-based superconductor K0.8Fe1.7Se2 (Tc30K). Clear band dispersion is observed with the overall bandwidth renormalized by a factor of 2.5 compared to our local density approximation calculations, indicating relatively strong correlation effects. Only an electronlike band crosses the Fermi energy, forming a nearly circular Fermi surface (FS) at M (π, 0). The holelike band at Γ sinks 90meV below the Fermi energy, with an indirect band gap of 30 meV, to the bottom of the electronlike band. The observed FS topology in this superconductor favors (π, π) inter-FS scattering between the electronlike FSs at the M points, in sharp contrast to other iron-based superconductors which favor (π, 0) inter-FS scattering between holelike and electronlike FSs.

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  • Received 30 December 2010

DOI:https://doi.org/10.1103/PhysRevLett.106.187001

© 2011 American Physical Society

Authors & Affiliations

T. Qian1, X.-P. Wang1, W.-C. Jin2, P. Zhang1, P. Richard1, G. Xu1, X. Dai1, Z. Fang1, J.-G. Guo1, X.-L. Chen1, and H. Ding1

  • 1Beijing National Laboratory for Condensed Matter Physics, and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
  • 2Department of Physics, Renmin University, Beijing 100872, China

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Vol. 106, Iss. 18 — 6 May 2011

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