Antiferromagnetic metal to heavy-fermion metal quantum phase transition in the Kondo lattice model: A strong-coupling approach
Ki-Seok Kim,Mun Dae Kim +1 more
TL;DR: In this paper, the authors studied the quantum phase transition from an antiferromagnetic metal to a heavy fermion metal in the Kondo lattice model and showed that the volume change of Fermi surface becomes continuous across the transition.
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Abstract: We study the quantum phase transition from an antiferromagnetic metal to a heavy fermion metal in the Kondo lattice model. Based on the strong coupling approach we {\it first} diagonalize the Kondo coupling term. Since this strong coupling approach makes the resulting Kondo term {\it relevant}, the Kondo hybridization persists even in the antiferromagnetic metal, indicating that fluctuations of Kondo singlets are not critical in the phase transition. We find that the quantum transition in our strong coupling approach results from {\it softening of antiferromagnetic spin fluctuations of localized spins}, driven by the Kondo interaction. Thus, the volume change of Fermi surface becomes continuous across the transition. ......
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Citations
Quantum Boltzmann equation study for the Kondo breakdown quantum critical point
Ki-Seok Kim,Pépin C +1 more
TL;DR: The quantum Boltzmann equation approach for the Kondo breakdown quantum critical point is developed, involved with two bands for conduction electrons and localized fermions, and vertex corrections associated with hybridization fluctuations turn out to be irrelevant due to the heavy mass of spinons in the so called decoupling limit.
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The Kondo-lattice state and non-Fermi-liquid behavior in the presence of Van Hove singularities
TL;DR: A scaling consideration of the Kondo lattices is performed with account of logarithmic Van Hove singularities (VHS) in the electron density of states, and it is demonstrated that VHS lead to a considerable increase of the non-Fermi-liquid behavior region.
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Quantum Boltzman equation study for the Kondo breakdown quantum critical point
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TL;DR: In this article, the role of vertex corrections in transport is addressed, crucial for non-Fermi liquid transport of temperature linear dependence, and the quantum Boltzman equation approach for the Kondo breakdown quantum critical point is developed.
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Spin-gapped incoherent metal with preformed pairing in the doped antiferromagnetic Mott insulator
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TL;DR: In this paper, a spin-gapped incoherent metal with preformed pairing was identified as an intermediate phase between the antiferromagnetic Mott insulator and the $d$-wave superconductor.
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