Co doping effects on structural, electronic and magnetic properties in Mn2VGa

► The spin polarization for x=0.5 is 34%, much lower than the other concentrations. ► The compounds of x=0.0, 0.25 show nearly half-metallicity. ► The compounds of x=0.75, 1.0 exhibit the half-metallic character. ► The local moments for x=0.5 quite depart from the linear trend. ► The majority-spin component at the Fermi level increases with Co doping when x≤0.75.