Abstract
In order to study the energy levels of the magnetic excitations in antiferromagnetic CoO, we have measured the cross-section for inelastic n-scattering of CoO powder at various scattering angles θ and energy transfer from 15 to 70 meV. For large θ purely nuclear scattering is observed, while for small θ the cross-section is predominantly due to magnetic scattering with some nuclear contributions. The cross-section shows several peaks, which have not yet been observed. By comparison of the results of pure CoO and of Co 0.8Ni 0.2O two peaks in the cross-section can be assigned to single ion-like transitions in the ground state multiplet of Co 2+ in the antiferromagnetic phase. The parameters of a simple molecular field model are discussed.
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