Cycloidal magnetic order in the compound IrMnSi

Eriksson, Therese (author): Uppsala universitet,Institutionen för materialkemi

Felton, S. (author): Uppsala universitet,Institutionen för teknikvetenskaper

Nordblad, Per (author): Uppsala universitet,Institutionen för teknikvetenskaper

Andersson, Yvonne (author): Uppsala universitet,Institutionen för materialkemi

Tellgren, Roland (author): Uppsala universitet,Institutionen för materialkemi

(creator_code:org_t)

2005
2005
English.
In: Physical Review B. Condensed Matter and Materials Physics. - 1098-0121 .- 1550-235X. ; 71:17

Related links:: https://urn.kb.se/re...; show more...; https://doi.org/10.1...; https://urn.kb.se/re...; show less...

Abstract Subject headings

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.

By the author/editor: Eriksson, Theres ...; Bergqvist, Lars, ...; Burkert, T.; Felton, S.; Nordblad, Per; Eriksson, Olle; show more...; Andersson, Yvonn ...; Tellgren, Roland; show less...

About the subject

NATURAL SCIENCES: NATURAL SCIENCES; and Physical Science ...; and Condensed Matter ...

NATURAL SCIENCES: NATURAL SCIENCES; and Chemical Science ...; and Inorganic Chemis ...

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