Electronic and structural properties of Laves-phase MgZn2 of varying chemical disorder

M. Andersson, M. De Boissieu, S. Brühne, C. Drescher, W. Assmus, S. Ohahshi, A. P. Tsai, M. Mihalkovič, M. Krajčí, Ö Rapp

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    9 Citations (Scopus)

    Abstract

    The C14 Laves-phase MgZn2 has been investigated from 30 to 36 at. % Mg. In this way chemical disorder can be monitored over a limited concentration range and the influence on electron properties can be investigated. Our studies include thermodynamic calculations of atomic configurations of Mg and Zn at off-stoichiometric compositions, electronic-transport measurements, and electronic band-structure calculations of MgZn2. The disorder introduced by alloying was found to be substitutional for all C14 alloys, and to have a markedly stronger effect on resistivity and magnetoresistance, Δρ (B) /ρ (0), on the Mg-rich side due to strain introduced when Mg substitutes for Zn. ρ(T) and Hall constant were characteristic for weakly disordered binary alloys. Δρ/ρ of MgZn2 was large, reached 6 at 4.2 K and 8 T, and decreased strongly at off-stoichiometric compositions. The results are discussed in view of the band-structure results and in terms of relations between atomic order and electronic properties. Several properties were found to resemble pure Zn. An empirical correlation over more than six orders of magnitude in Δρ/ρ was found for Zn and Zn-based alloys.

    Original languageEnglish
    Article number024202
    JournalPhysical Review B - Condensed Matter and Materials Physics
    Volume82
    Issue number2
    DOIs
    Publication statusPublished - 2010 Jul 13

    ASJC Scopus subject areas

    • Electronic, Optical and Magnetic Materials
    • Condensed Matter Physics

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