Surface Geometric and Electronic Structures of BaFe2As2(001)

V. B. Nascimento, Ang Li, Dilushan R. Jayasundara, Yi Xuan, Jared O’Neal, Shuheng Pan, T. Y. Chien, Biao Hu, X. B. He, Guorong Li, A. S. Sefat, M. A. McGuire, B. C. Sales, D. Mandrus, M. H. Pan, Jiandi Zhang, R. Jin, and E. W. Plummer
Phys. Rev. Lett. 103, 076104 – Published 14 August 2009

Abstract

BaFe2As2 exhibits properties that are characteristic of the parent compounds of the newly discovered iron (Fe)-based high-TC superconductors. By combining real-space imaging of scanning tunneling microscopy and spectroscopy (STM+STS) with momentum-space quantitative low-energy electron diffraction (LEED), we have identified the surface plane of cleaved BaFe2As2 crystals as the As terminated Fe-As layer—the plane where superconductivity occurs. LEED and STM+STS data on the BaFe2As2(001) surface indicate an ordered arsenic (As) terminated metallic surface without reconstruction or lattice distortion. It is surprising that STM images the different Fe-As orbitals associated with the orthorhombic structure, but not the As atoms in the surface plane.

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  • Received 19 May 2009

DOI:https://doi.org/10.1103/PhysRevLett.103.076104

©2009 American Physical Society

Authors & Affiliations

V. B. Nascimento1,*, Ang Li2, Dilushan R. Jayasundara2, Yi Xuan2, Jared O’Neal2, Shuheng Pan2, T. Y. Chien3, Biao Hu3, X. B. He1, Guorong Li3, A. S. Sefat4, M. A. McGuire4, B. C. Sales4, D. Mandrus4, M. H. Pan4, Jiandi Zhang1, R. Jin1, and E. W. Plummer1

  • 1Department of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803-4001, USA
  • 2Department of Physics and Texas Center for Superconductivity, University of Houston, Houston, Texas 77204-5002, USA
  • 3Department of Physics and Astronomy, The University of Tennessee, Knoxville, Tennessee 37996, USA
  • 4Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA

  • *vnascimento@lsu.edu

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Vol. 103, Iss. 7 — 14 August 2009

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