Magneto-Optical Measurements on the 0.839 eV Emission in GaAs:Cr
The origin of the 0.839 eV emission in semi-insulating GaAs:Cr has been investigated by optically detected magnetic resonance (ODMR) and Zeeman spectroscopy on the zero phonon line and satellites. The Zeeman measurements have been carried out for B∥<111>, <110> and <100> as well as angular dependence of the splittings in the (110) plane. The results show that the centre has a symmetry axis along the < 111> direction, with a small orthorhombic distortion and these conclusions are in agreement with the ODMR signal angular dependence. The experiments show that the emission does not arise from the <100> Jahn-Teller distorted Cr2+ centre observed in EPR but is due to a <111> centre such as that suggested by White where an exciton recombines at a (Cr2+-D+) pair.
KeywordsAngular Dependence Zeeman Splitting Optically Detect Magnetic Resonance Defect Axis Optically Detect Magnetic Resonance Spectrum
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- 2.White, A.M., Krebs, J.J. and Stauss, G.H. (1980). Solid St. Commun., in pressGoogle Scholar
- 7.Lightowlers, E.C., Henry, M.O. and Penchina, C.M. (1978). Inst. Phys. Conf. Ser., 43, 307Google Scholar
- 11.Title, R.S. (1967). The Physics and Chemistry of II–VI Compounds (Eds M. Aven and J.S. Prener), ch. 6. Amsterdam; North HollandGoogle Scholar
- 13.Cavenett, B.C. (1978). Luminescence Spectroscopy (Ed. M.D. Lumb), ch. 5. London; Academic PressGoogle Scholar
- 14.Cavenett, B.C. Advances in Physics, to be publishedGoogle Scholar