Abstract
Acoustic paramagnetic resonance and thermally detected, electric-field-induced electron paramagnetic resonance experiments have been carried out at liquid helium temperatures on the Ni3+ ion in Al2O3. Five features in the spectra are identified and it is shown that dependence on the angle between the magnetic field and the c axis can be explained by an effective Hamiltonian operating within the 2E ground state only but including the effects of the trigonal field and spin-orbit coupling by perturbation theory. The same hamiltonian also gives a complete explanation of the original electron paramagnetic resonance measurements of Geschwind and Remeika (1962) and of recent thermal-conductivity scattering experiments.
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