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

Magnetischer Zirkulardichroismus und Gitterplatz selektive optisch detektierte magnetische Resonanz der tiefen, amphoteren Vanadium Verunreinigung in 6H-SiC
: Kunzer, M.; Müller, H.D.; Kaufmann, U.


Physical Review. B 48 (1993), Nr.15, S.10846-10854
ISSN: 0163-1829
ISSN: 1098-0121
ISSN: 0556-2805
Fraunhofer IAF ()
6H-SiC; MCD; MCD-ESR; vanadium

Magnetic-circular-dichroism (MCD) absorption and optically detected electron-spin-resonance (ESR) data for the neutral vanadium impurity, Vhigh4plus(3dhigh1) on the alpha, beta and gamma 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 Vhigh4plus on each of the three Si sites. This information is used to account for the Vhigh4plus MCD zero-phonon-line positions, signs, and relative intensities without an adjustable parameter. Evidence of Jahn-Teller effects is found in both the Vhigh4plus high2 E ground and the high2 T sub2 excited states. The MCD-ESR technique, in the present case, is site selective. The Vhigh4plus resonances associated with the beta and gamma site are virtually identical and cannot be distinguished by conventional ESR. The g factors for all three sites are satisfactorily expla ined within the framework of crystal-field theory.