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Crystal and magnetic structure of Mn3IrSi
Department of Physics, Uppsala University.ORCID iD: 0000-0003-4341-5663
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2004 (English)In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 69, no 5, 544221-544227 p.Article in journal (Refereed) Published
Abstract [en]

A new ternary Ir-Mn-Si phase with stoichiometry Mn3IrSi has been synthesized and found to crystallize in the cubic AlAu4-type structure, space groupP213 with Z=4, which is an ordered form of the β-Mn structure. The unit cell dimension was determined by x-ray powder diffraction to a=6.4973(3)Å. In addition to the crystal structure, we have determined the magnetic structure and properties using superconducting quantum interference device magnetometry and Rietveld refinements of neutron powder diffraction data. A complex noncollinear magnetic structure is found, with magnetic moments of 2.97(4)μB at 10 K only on the Mn atoms. The crystal structure consists of a triangular network built up by Mn atoms, on which the moments are rotated120° around the triangle axes. The magnetic unit cell is the same as the crystallographic and carries no net magnetic moment. The Néel temperature was determined to be 210 K. A first-principles study, based on density functional theory in a general noncollinear formulation, reproduces the experimental results with good agreement. The observed magnetic structure is argued to be the result of frustration of antiferromagnetic couplings by the triangular geometry.

Place, publisher, year, edition, pages
2004. Vol. 69, no 5, 544221-544227 p.
National Category
Condensed Matter Physics
URN: urn:nbn:se:kth:diva-62593DOI: 10.1103/PhysRevB.69.054422ISI: 000220001700056OAI: diva2:480643
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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