3D band structure determination of BaFe2As2, CaFe2As2 and SrFe2As2

ORAL

Abstract

The band structure of the parent compounds of iron-arsenic superconductors BaFe2As2, CaFe2As2 and SrFe2As2 are investigated by angle-resolved photoemission spectroscopy. The dispersion of predominant Fe 3d bands has been successfully resolved and compared with theoretical calculations. Although the overall band structure is in line with nonmagnetic DFT computations, the Fe 3d band dispersions strongly deviate from calculations, and the Fermi surface topology differs from theoretical results. These results suggest that some significant correlations have not been correctly involved in the current understanding of these new materials. The kz dependence of the band structure has also been studied for these quasi-2D materials.

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Authors

  • Qiang Wang

    Department of Physics, University of Colorado Boulder

  • Zhe Sun

    Department of Physics, University of Colorado Boulder

  • F. Ronning

    Los Alamos National Laboratory, LANL, Los Alamas, NM, USA, Los Alamos National Laboratory, Los Alamos, NM 87544, USA

  • E.D. Bauer

    Los Alamos National Laboratory, Los Alamos Natl. Lab., NM, USA, Los Alamos National Laboratory, Los Alamos, NM 87544, USA

  • Suchitra Sebastian

    Cavendish Lab, Cambridge, UK, Cambridge University

  • Daniel Dessau

    Department of Physics and JILA, University of Colorado Boulder