EPR Parameters of the Trigonal Fe+ Ga-SP Pair Defect in n-Type GaP Codoped with Iron and Sulphur

Abstract

The EPR parameters (g factors gII, g⊥, and zero-field splitting D) of a trigonal Fe+ center (which is assigned to a donor-acceptor pair defect Fe+ Ga-SP caused by S2− at a nearest-neighbor P3− site of an Fe+ Ga impurity) in n-type GaP codoped with iron and sulphur are calculated from high-order perturbation formulas based on the two spin-orbit coupling parameter model for the EPR parameters of a 3d7 ion in trigonal symmetry. The calculated results agree well with the observed values, suggesting that the assignment is suitable