Surface vacancies at the fivefold icosahedral Al-Pd-Mn quasicrystal surface: A comparison of ab initio calculated and experimental STM images

Marian Krajci, Juergen Hafner, J Ledieu, R McGrath

    Veröffentlichungen: Beitrag in FachzeitschriftArtikelPeer Reviewed

    Abstract

    Scanning tunneling microscopy (STM) images of the fivefold surface of the icosahedral (i) Al-Pd-Mn quasicrystal have been calculated using ab initio density functional methods. The STM signal is formed predominantly by the Al atoms in the surface plane. The Pd atoms are seen in the STM image as dark spots. The reason for their small contribution to the STM current is a small local density of states around the Fermi level and the localized d -character of the Pd states. On the other hand, the local paramagnetic density of states on Mn atoms is much higher than that on Pd atoms and therefore Mn atoms are seen in the STM images as bright spots. A direct comparison of the experimental images obtained from the STM with the ab initio calculated STM images reveals that the characteristic features of the images-the dark pentagonal holes-can also be created by surface vacancies and not only by truncated Bergman clusters as it has been supposed up to now. Œ 2006 The American Physical Society.
    OriginalspracheEnglisch
    Aufsatznummer024202
    Seitenumfang8
    FachzeitschriftPhysical Review B
    Jahrgang73
    Ausgabenummer2
    DOIs
    PublikationsstatusVeröffentlicht - 2006

    ÖFOS 2012

    • 103009 Festkörperphysik
    • 103015 Kondensierte Materie
    • 103025 Quantenmechanik
    • 103036 Theoretische Physik

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