  In a recent publication [Galanakis I et al 2006 \PR B \textbf{74} 140408(R)]
we have shown that in the case of CrAs and related transition-metal
chalcogenides and pnictides, crystallizing in the zinc-blende structure, the
excess of the transition-metal atoms leads to half-metallic ferrimagnetism. The
latter property is crucial for spintronic applications with respect to
ferromagnets due to the lower stray fields created by these materials. We
extend this study to cover the case where the transition-metal atoms sitting at
antisites are not identical to the ones in the perfect sites. In Cr-based
compounds, the creation of Mn antisites keeps the half-metallic ferrimagnetic
character produced also by the Cr antisites. In the case of VAs, Cr and Mn
antisites keep the half-metallic character of VAs (contrary to V antisites) due
to the larger exchange-splitting exhibited by these atoms.
