Weak ferromagnetism with the Kondo screening effect in the Kondo lattice systems

Abstract

We carefully consider the interplay between ferromagnetism and the Kondo screening effect in the conventional Kondo lattice systems at finite temperatures. Within an effective mean-field theory for small conduction electron densities, a complete phase diagram has been determined. In the ferromagnetic ordered phase, there is a characteristic temperature scale to indicate the presence of the Kondo screening effect. We further find two distinct ferromagnetic long-range ordered phases coexisting with the Kondo screening effect: spin fully polarized and partially polarized states. A continuous phase transition exists to separate the partially polarized ferromagnetic ordered phase from the paramagnetic heavy Fermi liquid phase. These results may be used to explain the weak ferromagnetism observed recently in the Kondo lattice materials.

6 pages, 6 figures; published version

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Cited by in corpus (4)

• Competition of striped magnetic order and partial Kondo screened state in the Kondo lattice model
• Kondo-lattice-mediated interactions in flat band systems
• Nonlinear response induced by Ferromagnetism in a Noncentrosymmetric Kondo Lattice system
• Metamagnetic transition in the two $f$ orbitals Kondo lattice model