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000017871 1001_ $$0P:(DE-HGF)0$$aGalanakis, I.$$b0
000017871 245__ $$aStability of ferromagnetism against doping in half-metallic alloys
000017871 260__ $$aMelville, NY$$bAmerican Institute of Physics$$c2011
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000017871 520__ $$aWe use a rigid band model to simulate doping in half-metallic NiMnSb and CoMnSb semi-Heusler alloys. Using first-principles calculations we calculate the intrasublattice exchange constants and the Curie temperature for these alloys as a function of the shift of the Fermi level and compare them also with the case of half-metallic CrAs and CrSe zinc-blende alloys. We show for all four compounds that the interactions between Cr-Cr(Mn-Mn) nearest neighbors are sufficient to explain the behavior of the Curie temperature. The interplay between the ferromagnetic RKKY-like and the antiferromagnetic superexchange interactions depends strongly on the details of the density of states around the minority-spin gap and thus it is found to be alloy-dependent. (C) 2011 American Institute of Physics. [doi:10.1063/1.3592168]
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000017871 8567_ $$uhttp://dx.doi.org/10.1063/1.3592168
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