Lifshitz phase transitions in the ferromagnetic regime of the Kondo lattice model

Abstract

We establish the low-temperature phase diagrams of the spin-1/2 and spin-1 Kondo lattice models as a function of the conduction-band filling n and the exchange coupling strength J in the regime of ferromagnetic effective exchange interactions (n ~< 0.5). We show that both models have several distinct ferromagnetic phases separated by continuous Lifshitz transitions of the Fermi-pocket vanishing or emergence type: one of the phases has a true gap in the minority band (half metal), the others only a pseudogap. They can be experimentally distinguished by their magnetization curves; only the gapped phase exhibits magnetization rigidity. We find that, quite generically, ferromagnetism and Kondo screening coexist rather than compete, both in spin-1/2 and spin-1 models. We compute the Curie temperatures and establish a "ferromagnetic Doniach diagram" for both models.

5 pages, 6 figures + Supplemental material

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• A unified theory of ferromagnetic quantum phase transitions in heavy fermion metals
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• An emerging global picture of heavy fermion physics
• Topological properties of magnetically ordered heavy-fermion systems in the presence of mirror symmetry
• Photo-emission signatures of coherence breakdown in Kondo alloys: dynamical mean-field theory approach
• Metamagnetic transition in the two $f$ orbitals Kondo lattice model
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