Half-metallic ferrimagnetism in the full-Heusler compound Co2ScSb

► The total spin moment is 2 μB at the equilibrium lattice constant a0 = 6.21 Å. ► The spin-up electrons are metallic. ► The spin-down bands are semiconductor with a gap of 0.38 eV. ► The spin-flip gap is of 0.24 eV. ► Half-metallicity is stable for a wide range of lattice constants.