Antiferromagnetic metal to heavy-fermion metal quantum phase transition in the Kondo lattice model: A strong coupling approach

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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Cited by in corpus (7)

• How to control pairing fluctuations: SU(2) slave-rotor gauge theory of the Hubbard model
• Lifshitz transition in Kondo alloys
• The Kondo-lattice state and non-Fermi-liquid behavior in the presence of Van Hove singularities
• Quantum Boltzman equation study for the Kondo breakdown quantum critical point
• Spin-gapped incoherent metal with preformed pairing in the doped antiferromagnetic Mott insulator
• Superconductivity from purely repulsive interactions in the strong coupling approach : Application of the SU(2) slave-rotor theory to the Hubbard model
• Fermionization for charge degrees of freedom and bosonization of spin degrees of freedom in the SU(2) slave-boson theory