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Report No.

Ferromagnetic states in the periodic Anderson model

Kubo, Katsunori 

We study ferromagnetic states in the periodic Anderson model by using the Gutzwiller method. We find three ferromagnetic states: a weakly polarized state, a half-metallic state, and a ferromagnetic state with an almost completely polarized f-electron state. Between these ferromagnetic states, the structure of the Fermi surface is different. In the paramagnetic state, a large Fermi-surface is realized. The topology of the Fermi surface in the weakly polarized state is the same as in the paramagnetic state. In the half-metallic state, the Fermi surface for the majority spin disappears. In the ferromagnetic state with large f-electron polarization, a small Fermi-surface is realized. Then, the phase transitions between these ferromagnetic states accompany change in the Fermi-surface topology, called Lifshitz transitions.



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