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Inelastic neutron scattering has been employed to study the crystalline-electric-field interaction of the distorted perovskite PrGaO 3 . The observed energy spectra show several well defined inelastic peaks of magnetic origin in an energy transfer range up to 86 meV which are attributed to crystalline-electric-field transitions within the ground-state J multiplet 3 H 4 of the Pr 3+ ions. The spectra are analysed in terms of single-particle crystal-field theory based on geometrical coordinations associated with the C s site symmetry of the Pr 3+ ions. J mixing as well as the imaginary part of the crystal-field Hamiltonian are found to be important to reproduce the experimental data. The resulting crystal-field parameters are close to the values extrapolated from a similar study of NdGaO 3 . Our approach turns out to constitute a useful extrapolation scheme for other structurally related perovskite-type compounds.
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Podlesnyak et al. (1994) studied this question.
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