Abstract
We investigate the coexistence of ferromagnetism and intermediate valence in 4f-systems which have ferromagnetic ground-states in the normal-valence phase and fluctuate between a magnetic and a nonmagnetic state in the intermediatevalence phase. The Curie temperature Tc and the static susceptibility X are discussed as functions of the f-level position Ef and the hybridization V for “semiconducting” as well as “metallic” f-systems. It turns out that electronic fluctuations destabilize the local f-moment, but simultaneously enhance the indirect coupling between them. This leads to a distinct Tc-maximum just in the intermediate valence phase.
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