The Kondo-lattice state and non-Fermi-liquid behavior in the presence of Van Hove singularities

Abstract

A scaling consideration of the Kondo lattices is performed with account of logarithmic Van Hove singularities (VHS) in the electron density of states. The scaling trajectories are presented for different magnetic phases. It is demonstrated that VHS lead to a considerable increase of the non-Fermi-liquid behavior region owing to softening of magnon branches during the renormalization process. Although the effective coupling constant remains moderate, renormalized magnetic moment and spin-fluctuation frequency can decrease by several orders of magnitude. A possible application to f-systems and weak itinerant magnets is discussed.

Final version, 12 pages, misprints of the printed version are corrected

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Cited by in corpus (7)

• Kondo effect of cobalt adatom on zigzag graphene nanoribbon
• Unconventional magnetism of the Kondo lattice
• The Kondo effect in the presence of Van Hove singularities: A numerical renormalization group study
• Electronic correlations, spectral and magnetic properties of ZrZn${}_2$
• Kondo screening and coherence in kagome local-moment metals: Energy scales of heavy fermions in the presence of flat bands
• Magnetic ordering and non-Fermi-liquid behavior in the multichannel Kondo-lattice model
• One- and two-channel Kondo model with logarithmic Van Hove singularity: a numerical renormalization group solution