A study of Mn3+ions in Al2O3from uniaxial stress data

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Abstract
A theoretical analysis of experimental data obtained recently by Raman and tunnel-junction phonon spectroscopy experiments on the Mn3+:Al2O3 system is presented. The Jahn-Teller model is re-examined and extended to include the effects of uniaxial stress. The model is shown to give a satisfactory explanation of all the experimental data available on this system and from the computed fit it is concluded that the ion-lattice coupling constant VEb=44500+or-12500 cm-1. The results obtained for Mn3+ are then compared with the values for the parameters deduced previously for the isoelectronic Cr2+ ion in the same host. Mn3+ appears to experience a much smaller trigonal field than Cr2+ and the implications of this result in relation to other experiments are discussed in detail.