Kink during the formation of the Kondo resonance band in the heavy fermion system

Abstract

We have investigated the formation of the Kondo resonance (KR) band and the hybridization gap (HG) in the heavy fermion compound CeCoGe2, using a combined approach of the density functional theory (DFT) and the dynamical mean field theory (DMFT). Low temperature (T) spec-tral functions show dispersive KR states, similarly to the recent experimental observation. During the evolution from the nonf conduction band state at high T to the dispersive KR band state at low T, which have topologically different band shapes, we have found the existence of kinks in the spectral function near EF . The observation of kink is clearly in correspondence with the multiple temperature scale of the formation of the KR band. We suggest that the detailed analysis on the abrupt change of electron velocity and the scattering rate near the Fermi level will provide crucial information for the heavy fermion system.

5 pages, 4 figures, Supplementary movie 1 is provided on the webpage(http://db.tt/fB4HQEJi)

References in corpus (8)

• Strength of the Spin-Fluctuation-Mediated Pairing Interaction in a High-Temperature Superconductor
• Modelling the Localized to Itinerant Electronic Transition in the Heavy Fermion System CeIrIn5
• Kinks in the dispersion of strongly correlated electrons
• High energy kink in the single particle spectra of the two-dimensional Hubbard model
• Poor Man's Understanding of Kinks Originating from Strong Electronic Correlations
• Emergent Collective Modes and Kinks in Electronic Dispersions
• Characteristics of oxygen isotope substitutions in the quasiparticle spectrum of Bi${}_2$Sr${}_2$CaCu${}_2$O${}_{8+\delta }$
• Kinks in the periodic Anderson model

Cited by in corpus (7)

• Metal-insulator Transition in VO2: a DFT+DMFT perspective
• Covalency in transition metal oxides within all-electron Dynamical Mean Field Theory
• Evolution of the Kondo lattice electronic structure above the transport coherence temperature
• The phonon softening due to melting of the ferromagnetic order in elemental iron
• Emergence of Kondo resonance in graphene intercalated with cerium
• Hybridization and Correlation between f- and d-orbital electrons in a valence fluctuating compound EuNi2P2
• A "hidden" transition in heavy fermion compound CeB${}_6$ at $T\sim$ 20 K?