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Flux growth of ZnO crystals doped by transition metals

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    0374228 - FZÚ 2012 RIV NL eng J - Journal Article
    Sofer, Z. - Sedmidubský, D. - Huber, Š. - Hejtmánek, Jiří - Maryško, Miroslav - Jurek, Karel - Mikulics, M.
    Flux growth of ZnO crystals doped by transition metals.
    Journal of Crystal Growth. Roč. 314, č. 1 (2011), 123-128. ISSN 0022-0248
    R&D Projects: GA ČR GA104/09/0621
    Institutional research plan: CEZ:AV0Z10100521
    Keywords : growth from high temperature solutions * oxides * zinc compounds * magnetic materials * semiconducting ii–vi materials
    Subject RIV: BM - Solid Matter Physics ; Magnetism
    Impact factor: 1.726, year: 2011

    ZnO crystals doped with Cr,Mn,Fe and Co were grown by the flux method.The prepared crystals revealed no phase separation detectable by X-ray diffraction.Structure properties were characterized by Raman and photoluminescence spectroscopy.For ZnO:Co,Mn andCr,no spontaneous ferromagnetic moment was observed up to T = 2 K whereas for the ZnO:Fe crystals the m(H) curves suggest the existence of 5nm superparamagnetic iron clusters.At low temperatures the m(H) curves can be interpreted as a superposition of major paramagnetic and minor antiferromagnetic contribution.The paramagnetic part corresponds to the presence of Co2+, Fe3+, Mn2+ ions and small Cr atom clusters.
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