An electron paramagnetic resonance and magneto-optical study of vanadium in

Abstract

The vanadium-related defects in high-resistivity Bridgman-grown (x = 0.04, 0.10) crystals have been studied by electron paramagnetic resonance (EPR) and magnetic circular dichroism absorption spectroscopy (MCDA). Only one vanadium-related spectrum is observed by EPR, which is attributed to a defect in orthorhombic point symmetry. Its spin Hamiltonian parameters are electron spin S = 3/2, Landé g-tensor , , , crystal field splitting parameters and , nuclear spin I = 7/2, hyperfine tensor , , with the principal axes x, y, z oriented along the [110] , [001], [-110] directions respectively. The MCDA measurements performed on the same crystals show in addition to the absorption bands of the ion those of the ion, a defect not observed by EPR; the non-observation of the EPR spectrum is ascribed to a strong zero-field splitting of the groundstate. The low point symmetry of the defect is attributed to the formation of second nearest neighbour complexes in the Zn-alloyed CdTe samples.