First principle study on the electronic and magnetic properties in Zn0.75Cr0.25M (MÂ =Â S, Se, Te) semiconductors

► Ef and Ec of ZnCrM decrease as anionic atomic radius and electronegativity increase. ► ZnCrM is half-metallic with band gaps of 1.06, 0.65 and 0.83 eV, respectively. ► The conventional gaps decrease with the increase of anion radius successively. ► The effective potential is more attractive for minority spin than for the majority. ► The s-d interaction is repulsive, while p-d interaction is attractive.