Coherence and metamagnetism in the two-dimensional Kondo lattice model

Abstract

We report the results of dynamical mean field calculations for the metallic Kondo lattice model subject to an applied magnetic field. High-quality spectral functions reveal that the picture of rigid, hybridized bands, Zeeman-shifted in proportion to the field strength, is qualitatively correct. We find evidence of a zero-temperature magnetization plateau, whose onset coincides with the chemical potential entering the spin up hybridization gap. The plateau appears at the field scale predicted by (static) large-N mean field theory and has a magnetization value consistent with that of x=1-n_c spin-polarized heavy holes, where n_c < 1 is the conduction band filling of the noninteracting system. We argue that the emergence of the plateau at low temperature marks the onset of quasiparticle coherence.

8 pages, 6 figures

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• Large and Small Fermi-Surface Spin Density Waves in the Kondo Lattice Model
• Dynamically generated edge states in topological Kondo insulators
• Finite-temperature spectra and quasiparticle interference in Kondo lattices: From light electrons to coherent heavy quasiparticles
• Coherent heavy quasiparticles in CePt5 surface alloy
• Weak ferromagnetism with the Kondo screening effect in the Kondo lattice systems
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• Emergent Coherent Lattice Behavior in Kondo Nanosystems
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• Anderson lattice with explicit Kondo coupling: general features and the field-induced suppression of heavy-fermion state in ferromagnetic phase
• Magnetic states in a three-dimensional topological Kondo insulator
• Lifshitz Transitions in Magnetic Phases of the Periodic Anderson Model
• Phonons and the coherence scale of models of heavy fermions
• Observation of the J-sheet of the Fermi surface of YbRh2Si2
• Topological phase in a two-dimensional metallic heavy-fermion system
• Lifshitz transitions and quasiparticle de-renormalization in YbRh${}_2$Si${}_2$
• Competition of striped magnetic order and partial Kondo screened state in the Kondo lattice model
• Kondo screening and beyond: an x-ray absorption and dichroism study of CePt${}_5$/Pt(111)
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• Topological properties of magnetically ordered heavy-fermion systems in the presence of mirror symmetry
• Heavy quasiparticle bands in the underscreened quasiquartet Kondo lattice
• Nonlinear Pauli Susceptibilities in Sr${}_3$Ru${}_2$O${}_7$ and Universal Features of Itinerant Metamagnetism
• Magnetoresistance in paramagnetic heavy fermion metals
• Photo-emission signatures of coherence breakdown in Kondo alloys: dynamical mean-field theory approach
• Phases and phase transitions of an $S=3/2$ chain on metallic and semi-metallic surfaces