Abstract:

The optical absorption spectra of the covalent crystals ZnX (X=S, Se) doped with Co²⁺ are studied using the double covalency factors, which considers the anisotropic distortion of e_g and t_2g orbits for d electron. When the paramagnetic g factor is calculated, the contributions of the spin orbit coupling from the ligand ions are taken into account besides that from the central ion, which is the double ξ model. The calculated results indicate that the theoretical values coincide with the experimental values very well. This suggests that the method presented in this paper could be more valid to some strongly covalent crystals.

Key words: diluted magnetic semiconductors, double covalency factors, double spin orbit coupling