Structure and properties of CoMnSb in the context of half-metallic ferromagnetism
- Institut fuer Anorganische Chemie und Analytische Chemie, Johannes Gutenberg-Universitaet, Staudinger Weg 9, D-55099 Mainz (Germany)
- Institute of Physics, Polish Academy of Sciences, Aleja Lotnikow 32/46, 02-668 Warszawa (Poland)
- Institut fuer Materialchemie, TU Wien, A-1060 Vienna (Austria)
Although its X-ray powder diffraction patterns show a superstructure, the compound CoMnSb, like the well-known half-Heusler alloy NiMnSb, is often referred to the category of half-metallic ferromagnets with C1{sub b} structure. Our study assigns CoMnSb to space group Fm3m. The crystal structure of CoMnSb can be represented as an alternation of Co{sub 2}MnSb and MnSb structural units, and, in contrast to NiMnSb, displays three Mn and two Sb positions in the elementary cell. The presence of nonequivalent antimony and manganese positions was verified using NMR and Moessbauer spectroscopic measurements. Band-structure calculations based on a proposed structure confirm the experimentally found magnetic moment value of approximately 4 {mu}{sub B}/f.u. and demonstrate that CoMnSb is not a half-metallic ferromagnet.
- OSTI ID:
- 20853744
- Journal Information:
- Physical Review. B, Condensed Matter and Materials Physics, Vol. 74, Issue 13; Other Information: DOI: 10.1103/PhysRevB.74.134426; (c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 1098-0121
- Country of Publication:
- United States
- Language:
- English
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