Lattice-ion interactions of Ti3+ in corundum I. The Jahn-Teller effect and the theory of the effects of electric field and strain

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Abstract
The magnetic properties of a Ti3+ ion in an Al2O3 lattice are discussed using a dynamic Jahn-Teller model in which an orbital triplet interacts with the vibrational E modes of the ligands. Calculations of the effect of applied electric field and strain on the electron paramagnetic resonance spectra are made. It is found that second-order vibronic effects are very important in both cases. The linear electric field effect gives rise to large g shifts of the order 10-4 for an applied electric field of 1 kv cm-1 while the strain tensors are of order 102 per unit strain. Comparison is made with experimental results.

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