A dynamic Jahn-Teller model of Cr2+ centres in GaAs is developed as a basis for understanding the acoustic paramagnetic resonance (APR) spectrum. It is shown that first and second order spin-orbit coupling together produce two triplets and a singlet as the ground states of the system separate by a few cm-1. APR transitions are allowed between many of the Zeeman-split levels. The possibility of trigonal crystal fields is also considered and is consistent with some of the experimental data. The centres responsible for the APR spectrum appear to be very different from those seen by electron paramagnetic resonance.
KeywordsElectron Paramagnetic Resonance Paramagnetic Centre Electron Paramagnetic Resonance Data Donor Pair Longitudinal Acoustic Wave
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- 2.Clerjaud, B., Hennel, A.M. and Martinez, G. (1980). Solid St. Commun., in pressGoogle Scholar
- 3.Lightowlers, E.C., Henry, M.O. and Pechina, C.M. (1979). Inst. Phys. Conf. Ser., 43, 307Google Scholar
- 5.Ganapol’skii, A.M. (1975). Sov. Phys. Solid St., 16, 1868Google Scholar
- 6.Tokumoto, H. and Ishiguro, T. (1978). Internal Friction and Ultrasonic Attenuation in Solids (Eds R.R. Hasiguti and N. Mikooshiba), p. 177. Univ. of Tokyo PressGoogle Scholar
- 8.Bury, P., King, P.J. and Wiscombe. P. (1980). To be publishedGoogle Scholar