Abstract
In order to clarify the magnetic anisotropy of f-electron systems, we develop a microscopic theory based on a quasi-degenerate periodic Anderson model. From this model, generalized RKKY interactions are extracted. Then, it is shown that the dominant RKKY interaction reduces to be isotropic for systems with inversion symmetry when splitting energies between the ground state and the excited states of level scheme of f-electron become considerably large. This means that quasi-degeneracy of the Kramers doublets will be essential for the magnetic anisotropy only in f-electron systems with inversion symmetry.
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