Abstract
An explanation is given of the negative g shift in concentrated, bottlenecked systems under the assumption of positive exchange coupling between the localised spin sub-system and the band electrons. The effective spin Hamiltonian for d band electrons is derived, on the basis of which it is shown that the g factor for d band electrons differs from the free electron value. The effective g factor in Gd rich compounds is studied. The theoretical calculations are in good agreement with the experimental data.
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