Structural and magnetic characterization of Mn3IrGe and Mn3Ir(Si1-xGex): experiments and theory
2004 (English)In: Journal of Solid State Chemistry, ISSN 0022-4596, E-ISSN 1095-726X, Vol. 177, no 11, 4058-4066 p.Article in journal (Refereed) Published
The Structural and magnetic propertiesof a new ternary Ir-Mn-Ge phase, Mn3IrGe, as well as the solid solution Mn3Ir(Si1_xGex), O<x<1, have been investigated by means of X-ray and neutron powder diffraction, magnetization measurements and first principles calculations. The crystal structure is cubic, of the AlAu4-type (an ordered form of the ß-Mn structure), Z = 4. space group P213, and the unit-cell dimension varies linearly with the silicon content. For all compositions, antiferromagnetic
ordering is found below a critical temperature of about 225 K. The magnetic structure is noncollinear, as a result of frustrated magnetic interactions on a triangular network of Mn atoms, on which the moments rotate 120° around the triangle axes. The magnitude of the magnetic moment at 10 K is 3.39(4) µB for Mn3IrGe. The theoretical calculations reproduce with very good accuracy the magnitudes as well as the directions of the experimentally observed magnetic moments.
Place, publisher, year, edition, pages
2004. Vol. 177, no 11, 4058-4066 p.
Manganese-iridium germanide, Manganese-indium silicide, Neutron diffraction, Rietveld method, Magnetic structure, Crystal structure, First principles calculations, Susceptibility measurements, Magnetic frustration
Inorganic Chemistry Materials Engineering
IdentifiersURN: urn:nbn:se:uu:diva-92910DOI: 10.1016/j.jssc.2004.07.001OAI: oai:DiVA.org:uu-92910DiVA: diva2:166227