2013
DOI: 10.1103/physrevb.88.054431
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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… Show more

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Cited by 26 publications
(17 citation statements)
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“…Right in between, the FM1 phase is featured with an indirect energy gap separating the E + (p) and E − (p) bands, and the chemical potential lies just within the gap. We have thus a spin selective Kondo insulator [7][8][9]35], in which the holon phase shift can be calculated from the quasiparticle dispersions via…”
Section: Resultsmentioning
confidence: 99%
See 1 more Smart Citation
“…Right in between, the FM1 phase is featured with an indirect energy gap separating the E + (p) and E − (p) bands, and the chemical potential lies just within the gap. We have thus a spin selective Kondo insulator [7][8][9]35], in which the holon phase shift can be calculated from the quasiparticle dispersions via…”
Section: Resultsmentioning
confidence: 99%
“…Its resulting ferromagnetic (FM) or antiferromagnetic (AFM) long-range orders can often be suppressed by pressure, magnetic field, or chemical substitution and tuned to a heavy Fermi liquid (HFL) with an enhanced effective mass of Landau quasiparticles due to the Kondo screening by conduction electrons. However, unlike AFM Kondo lattices, whose magnetic quantum phase transitions (QPTs) and associated quantum criticality have been intensively studied in the past decades [3,4], the FM Kondo lattices are relatively less explored [5][6][7][8][9]. It has been believed that FM QPT in clean metallic systems should typically be of first order if not interrupted by other instabilities [10] because of non-analyticities in the free energy induced by certain soft modes related to the Fermi surfaces [11,12].…”
Section: Introductionmentioning
confidence: 99%
“…Finally, we want to note that a similar Lifshitz transition has been observed in the ferromagnetic phase of the Kondo lattice model. 54 Thus, a change in the Fermi-surface topology when increasing the interaction strength seems to be a general property of the Kondo lattice model and not specific to the SDW phase close to half filling.…”
Section: Discussionmentioning
confidence: 96%
“…In the other phases, both spin bands have Fermi surfaces, and thus a transition to the half-metallic state from any of the other states inevitably accompanies a change in the Fermi surface topology. Indeed, such transitions to the half-metallic state have been found in the Kondo lattice model [24][25][26][27][28][29][30][31] and in the periodic Anderson model. [32][33][34][35][36][37][38] In these theoretical studies, while the models are similar, the antiferromagnetic and ferromagnetic cases are treated separately except for a Kondo lattice model with the explicit inclusion of antiferromagnetic and ferromagnetic Heisenberg interactions.…”
Section: Introductionmentioning
confidence: 99%