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1992•Journal of Physics Condensed MatterOpen access

A V2+ion in GaAs studied by thermally detected EPR

A. Vasson, A F Labadz, N Tebbal, A. Vasson, A. Gavaix, C A Bates

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Abstract

New thermally detected electron paramagnetic resonance (TD-EPR) experiments at 35 GHz including photoinduced effects, are described. The resonances are attributed to a V 2+ (II) centre with a 4 T 1 ground state as before. In order to attempt to identify the nature of the centre, a trigonal model is presented which supposes that the V 2+ 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 V 2+ (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 V 2+ (II) is part of a complex.

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New thermally detected electron paramagnetic resonance (TD-EPR) experiments at 35 GHz including photoinduced effects, are described. The resonances are attributed to a V 2+ (II) centre with a 4 T 1 ground state as before. In order to attempt to identify the nature of the centre, a trigonal model is presented which supposes that the V 2+ 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 V 2+ (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 V 2+ (II) is part of a complex.

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Available abstract

New thermally detected electron paramagnetic resonance (TD-EPR) experiments at 35 GHz including photoinduced effects, are described. The resonances are attributed to a V 2+ (II) centre with a 4 T 1 ground state as before. In order to attempt to identify the nature of the centre, a trigonal model is presented which supposes that the V 2+ 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 V 2+ (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 V 2+ (II) is part of a complex.

Key concepts: Electron paramagnetic resonance, Ion, Trigonal crystal system, Resonance (particle physics), Chemistry, Atomic physics, Materials science, Nuclear magnetic resonance

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