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Cycloidal magnetic order in the compound IrMnSi
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. 71, no 17Article in journal (Refereed) Published
Abstract [en]

A new compound, IrMnSi, has been synthesized, and its crystal structure and magnetic properties have been investigated by means of neutron powder diffraction, magnetization measurements, and first-principles theory. The crystal structure is found to be of the TiNiSi type (ordered Co2P, space groupPnma). The Mn-projected electronic states are situated at the Fermi level, giving rise to metallic binding, whereas a certain degree of covalent character is observed for the chemical bond between the Ir and Si atoms. A cycloidal, i.e., noncollinear, magnetic structure was observed below 460 K, with the propagation vector q=[0,0,0.4530(5)] at 10 K. The magnetism is dominated by large moments on the Mn sites, 3.8μB∕atom from neutron diffraction. First-principles theory reproduces the propagation vector of the experimental magnetic structure as well as the angles between the Mn moments. The calculations further result in a magnetic moment of 3.2μB for the Mn atoms, whereas the Ir and Si moments are negligible, in agreement with observations. A calculation that more directly incorporates electron-electron interactions improves the agreement between the theoretical and experimental magnetic moments. A band mechanism is suggested to explain the observed magnetic order.

Place, publisher, year, edition, pages
2005. Vol. 71, no 17
National Category
Condensed Matter Physics
URN: urn:nbn:se:kth:diva-62595DOI: 10.1103/PhysRevB.71.174420ISI: 000229935000068OAI: diva2:480649
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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