K-Doping Dependence of the Fermi Surface of the Iron-Arsenic Ba1xKxFe2As2 Superconductor Using Angle-Resolved Photoemission Spectroscopy

Chang Liu, G. D. Samolyuk, Y. Lee, Ni Ni, Takeshi Kondo, A. F. Santander-Syro, S. L. Bud’ko, J. L. McChesney, E. Rotenberg, T. Valla, A. V. Fedorov, P. C. Canfield, B. N. Harmon, and A. Kaminski
Phys. Rev. Lett. 101, 177005 – Published 24 October 2008

Abstract

We use angle-resolved photoemission spectroscopy to investigate the electronic properties of the newly discovered iron-arsenic superconductor Ba1xKxFe2As2 and nonsuperconducting BaFe2As2. Our study indicates that the Fermi surface of the undoped, parent compound BaFe2As2 consists of hole pocket(s) at Γ (0,0) and larger electron pocket(s) at X (1,0), in general agreement with full-potential linearized plane wave calculations. Upon doping with potassium, the hole pocket expands and the electron pocket becomes smaller with its bottom approaching the chemical potential. Such an evolution of the Fermi surface is consistent with hole doping within a rigid-band shift model. Our results also indicate that the full-potential linearized plane wave calculation is a reasonable approach for modeling the electronic properties of both undoped and K-doped iron arsenites.

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  • Received 20 June 2008

DOI:https://doi.org/10.1103/PhysRevLett.101.177005

©2008 American Physical Society

Authors & Affiliations

Chang Liu1, G. D. Samolyuk1, Y. Lee1, Ni Ni1, Takeshi Kondo1, A. F. Santander-Syro2,3, S. L. Bud’ko1, J. L. McChesney4, E. Rotenberg4, T. Valla5, A. V. Fedorov4, P. C. Canfield1, B. N. Harmon1, and A. Kaminski1

  • 1Ames Laboratory and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA
  • 2Laboratoire Photons Et Matière, UPR-5 CNRS, ESPCI, 10 rue Vauquelin, 75231 Paris cedex 5, France
  • 3Labratoire de Physique des Solides, UMR-8502 CNRS, Université Paris-Sud, Bât. 510, 91405 Orsay, France
  • 4Advanced Light Source, Berkeley National Laboratory, Berkeley, California 94720, USA
  • 5Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, New York 11973, USA

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Issue

Vol. 101, Iss. 17 — 24 October 2008

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