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Magnetic properties of selected Mn-based transition metal compounds with β-Mn structure: Experiments and theory
Department of Physics, Uppsala University.ORCID iD: 0000-0003-4341-5663
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2005 (English)In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 72, no 14, 1-11 p.Article in journal (Refereed) Published
Abstract [en]

Two compounds, Mn3CoSi and Mn3CoGe have been synthesized and found to crystallize in the AlAu4 type structure, an ordered form of the β-Mnstructure. The magnetic structure and properties have been studied by magnetometry and neutron powder diffraction and the theoretical work is based on first principles total energy calculations. Comparison is made with the magnetic properties of the isostructural compounds Mn3IrGe and Mn3IrSi. The solid solutions Mn3Ir1−yCoySi (0⩽y⩽1) and Mn3CoSi1−xGex (0⩽x⩽1) are also studied. A noncollinear antiferromagnetic structure is experimentally observed for y=0.20 as well as for x=0.50 and 1.0, similar to that of Mn3IrSi and Mn3IrGe, with 120° angles between magnetic moments on a triangular network of Mn atoms, and this finding is corroborated by theoretical calculations. For y=0.80–1.0 a transformation to a new type of magnetic structure takes place. The magnetic transition temperature decreases on decreasing unit cell dimension, with good qualitative agreement with the decay of the calculated interatomic exchange energy. Both theory and experiments find the magnitude of the Mn magnetic moment to decrease on decreasing unit cell volume, the same trend is found in calculations for β-Mn.

Place, publisher, year, edition, pages
2005. Vol. 72, no 14, 1-11 p.
National Category
Condensed Matter Physics
URN: urn:nbn:se:kth:diva-62594DOI: 10.1103/PhysRevB.72.144427ISI: 000232934100057OAI: diva2:480646
QC 20120125Available from: 2012-01-19 Created: 2012-01-19 Last updated: 2012-01-25Bibliographically approved

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Bergqvist, Lars
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