Abstract
We derive the Fermion excitation spectrum of a cubic crystal of actinide ions with partly filled 5f shells. The crystal field and intraatomic interactions are assumed to be large compared to the one‐electron interatomic hopping energy, so that Hubbard's “atomic representation” is valid. The magnetic moment, the magnetic susceptibility, and the fractional valence of the actinide ions are calculated as functions of the temperature, the external (or internal) magnetic field, and the f‐f hopping energy. Assuming that the latter energy increases with decreasing lattice constant, one finds results in qualitative agreement with the variation from localized to itinerant magnetic behavior observed in intermetallic actinide compounds.
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