A V2+ion in GaAs studied by thermally detected EPR

Abstract

New thermally detected electron paramagnetic resonance (TD-EPR) experiments at 35 GHz including photoinduced effects, are described. The resonances are attributed to a V2+ (II) centre with a 4T1 ground state as before. In order to attempt to identify the nature of the centre, a trigonal model is presented which supposes that the V2+ ion is part of a complex in which one of the neighbouring As ions is replaced by a defect. It is shown that the TD-EPR results are consistent with such a model but this does not prove by itself that the V2+(II) ion is part of a complex. Other experimental results obtained by other techniques are also discussed and related to the TD-EPR data obtained here. After consideration of all the available data, the most probable conclusion is that V2+ (II) is part of a complex.

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