Magnetic circular dichroism and site-selective optically detected magnetic resonance of the deep amphoteric vanadium impurity in 6H-SiC.

Magnetic-circular-dichroism (MCD) absorption and optically detected electron-spin-resonance (ESR) data for the neutral vanadium impurity, V 4+ (3d 1 ) on the α, β, and γ sites in 6H-SiC are presented and supplemented by linearly polarized absorption and luminescence spectra. An analysis of the linearly polarized spectra yields crystal-field-level schemes in zero magnetic field and an intensity parameter u for V 4+ on each of the three Si sites. This information is used to account for the V 4+ MCD zero-phononline positions, signs, and relative intensities without an adjustable parameter. Evidence of Jahn-Teller effects is found in both the V 4+ 2 E ground and the 2 T 2 excited states