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Fermi states and anisotropy of Brillouin zone scattering in the decagonal Al–Ni–Co quasicrystal

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  • V. A. Rogalev

    (Swiss Light Source, Paul Scherrer Institute
    Present address: Physikalisches Institut and Röntgen Research Center for Complex Materials Systems, Universität Würzburg, Würzburg 97074, Germany.)

  • O. Gröning

    (EMPA, Swiss Federal Laboratories for Materials Science and Technology)

  • R. Widmer

    (EMPA, Swiss Federal Laboratories for Materials Science and Technology)

  • J. H. Dil

    (Swiss Light Source, Paul Scherrer Institute
    Institute of Condensed Matter Physics, Ecole Polytechnique Fédérale de Lausanne)

  • F. Bisti

    (Swiss Light Source, Paul Scherrer Institute)

  • L. L. Lev

    (Swiss Light Source, Paul Scherrer Institute
    National Research Center Kurchatov Institute, Akademika Kurchatova Square 1)

  • T. Schmitt

    (Swiss Light Source, Paul Scherrer Institute)

  • V. N. Strocov

    (Swiss Light Source, Paul Scherrer Institute)

Abstract

Quasicrystals (QCs) are intermetallic alloys that have excellent long-range order but lack translational symmetry in at least one dimension. The valence band electronic structure near the Fermi energy EF in such materials is of special interest since it has a direct relation to their unusual physical properties. However, the Fermi surface (FS) topology as well as the mechanism of QC structure stabilization are still under debate. Here we report the first observation of the three-dimensional FS and valence band dispersions near EF in decagonal Al70Ni20Co10 (d-AlNiCo) QCs using soft X-ray angle-resolved photoemission spectroscopy. We show that the FS, formed by dispersive Al sp-states, has a multicomponent character due to a large contribution from high-order bands. Moreover, we discover that the magnitude of the gap at the FS related to the interaction with Brillouin zone boundary (Hume–Rothery gap) critically differs for the periodic and quasiperiodic directions.

Suggested Citation

  • V. A. Rogalev & O. Gröning & R. Widmer & J. H. Dil & F. Bisti & L. L. Lev & T. Schmitt & V. N. Strocov, 2015. "Fermi states and anisotropy of Brillouin zone scattering in the decagonal Al–Ni–Co quasicrystal," Nature Communications, Nature, vol. 6(1), pages 1-7, December.
    • Handle: RePEc:nat:natcom:v:6:y:2015:i:1:d:10.1038_ncomms9607
    DOI: 10.1038/ncomms9607
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