Yu Liu, Guang-Ming Zhang, Lu Yu
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 under small conduction electron densities, the 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: a spin polarized phase and a non-polarized phase. A continuous phase transition exists to separate the spin non-polarized ferromagnetic ordered phase from the paramagnetic heavy Fermi liquid phase. These results may be used to explain the weak ferromagnetism discovered in the Kondo lattice materials.
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http://arxiv.org/abs/1301.1771
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