Journal Article

PreJuSER-6583

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Tuning the magnetic properties of half-metallic semi-Heusler alloys by sp-electron substitution: the case of AuMnSn1-xSbx quaternary alloys

Ozdogan, K. ; Sasioglu, E.FZJ* ; Galanakis, I.

2009
IOP Publ. Bristol

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Please use a persistent id in citations: doi:10.1088/0022-3727/42/8/085003

Abstract: We study the electronic and magnetic properties of the quaternary AuMnSn1-xSbx Heusler alloys using first principles calculations. We determine their magnetic phase diagram and show that they present a phase transition from a ferromagnetic (FM) to an antiferromagnetic (AFM) state with increasing Sb concentration. For large Sb concentrations the AFM superexchange coupling dominates over the FM RKKY-like exchange mechanism. This behaviour is similar to that demonstrated by the isovalent Ni1-xCuxMnSb alloy studied recently by the authors (Galanakis et al 2008 Phys. Rev. B 77 214417). Thus the variation of the concentration of the sp-electrons (Sn and Sb atoms) in the AuMnSn1-xSbx compound and the variation of the concentration of the non-magnetic 3d atoms (Cu) in Ni1-xCuxMnSb lead to a similar tuning of the magnetic properties of the two Heusler alloys. We show that the inclusion of correlation effects does not alter the phase diagram of the AuMnSn1-xSbx compound. The calculated results are in good agreement with the available experimental data.

Keyword(s): J

Note: Record converted from VDB: 12.11.2012

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Contributing Institute(s):

1. Quanten-Theorie der Materialien (IFF-1)
2. Quanten-Theorie der Materialien (IAS-1)
3. Jülich-Aachen Research Alliance - Fundamentals of Future Information Technology (JARA-FIT)

Research Program(s):

1. Grundlagen für zukünftige Informationstechnologien (P42)

Appears in the scientific report 2009

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