%0 Journal Article
%A Ozdogan, K.
%A Sasioglu, E.
%A Galanakis, I.
%T Tuning the magnetic properties of half-metallic semi-Heusler alloys by sp-electron substitution: the case of AuMnSn1-xSbx quaternary alloys
%J Journal of physics / D
%V 42
%@ 0022-3727
%C Bristol
%I IOP Publ.
%M PreJuSER-6583
%P 085003
%D 2009
%Z Record converted from VDB: 12.11.2012
%X 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.
%K J (WoSType)
%F PUB:(DE-HGF)16
%9 Journal Article
%U <Go to ISI:>//WOS:000265248300026
%R 10.1088/0022-3727/42/8/085003
%U https://juser.fz-juelich.de/record/6583