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Six half-metallic ferromagnets X 0.75 Y 0.25 C (X=Si, Ge, Sn and Y=Ca and Sr) with zinc-blende structure, resulting from alkaline-earth (Ca, Sr) substitution for X, are predicted based on the density functional theory. The calculated total magnetic moments of these ferromagnets are all integer 2.00μ B per supercell, which are one of important characters of half-metallic ferromagnets...
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