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. E-ISSN 1873-5002
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 ; AIS: 0.491, rok: 2011
DOI: https://doi.org/10.1016/j.jcrysgro.2010.11.148

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.
Permanent Link: http://hdl.handle.net/11104/0207193