Optical spectrum and EPR parameters for vanadium (V³⁺) in cadmium telluride

Abstract

The optical spectrum and electron paramagnetic resonance (EPR) parameters (gyromagnetic g factor and hyperfine structure constant A) for CdTe:V³⁺ have been calculated using the modified crystal-field theory. In this theory, the covalency factors N_t , N_e and the two spin-orbit (SO) coupling coefficients ζ_d, ζ_p are included in T _d symmetry. The calculated optical spectrum and EPR parameters agree reasonably well with the experimental values. In addition, the calculated results show that the contribution from the ligand Te²⁻ to the EPR parameters cannot be neglected because the ligand Te²⁻ possesses a large SO coupling coefficient and strong covalency.

Keywords:

• optical spectra
• EPR
• crystal-field theory
• ligand-field theory
• CdTe
• V³⁺

Acknowledgements

This work was partially supported by the Foundation of Chongqing University of Technology (Nos. 2008ZQ12, 2009ZD09) and the Term of Science and Technology of Chongqing Education Committee (No. KJ090608).