Semiconductivity in aluminum-transition-metal quasicrystalline alloys induced by ordering in six dimensions

Marian Krajci, Juergen Hafner

    Veröffentlichungen: Beitrag in FachzeitschriftArtikelPeer Reviewed

    Abstract

    We report on a class of icosahedral aluminum-transition-metal (Al-TM) alloys with true semiconducting behavior. The existence of a semiconducting gap is found to depend critically on a particular kind of Al-TM ordering defined by a simple rule in the 6-dimensional superspace. Any deviation from this 6D order leads to the formation of strongly localized defect states in the gap. We show that by a judicious selection of transition metals to be alloyed with Al, we can find alloys with a semiconducting gap at the Fermi level for a hierarchy of approximants to a quasicrystal. As the electron/atom ratio placing the Fermi level into the gap is slightly different for each approximant, this suggests that the gap persists also in the quasiperiodic limit. Icosahedral Al-Pd-Re turns out to be a semiconductor with a band gap filled by the localized states.
    OriginalspracheEnglisch
    Seiten (von - bis)63-68
    Seitenumfang6
    FachzeitschriftEurophysics Letters
    Jahrgang63
    Ausgabenummer1
    DOIs
    PublikationsstatusVeröffentlicht - 2003

    ÖFOS 2012

    • 1030 Physik, Astronomie

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