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On the Curie temperature of ferromagnetic 4f-systems with valence instabilities

Authors
Journal
Journal of Magnetism and Magnetic Materials
0304-8853
Publisher
Elsevier
Publication Date
Identifiers
DOI: 10.1016/0304-8853(87)90662-7
Disciplines
  • Physics

Abstract

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 intermediate-valence phase. The Curie temperature T c and the static susceptibility χ are discussed as functions of the f-level position E f 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 T c-maximum just in the intermediate valence phase.

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