Coherence and metamagnetism in the two-dimensional Kondo lattice model

Details Coherence and metamagnetism in the two-dimensional Kondo lattice model Coherence and metamagnetism in the two-dimensional Kondo lattice model

2008-02-07

arxiv.org/abs/0802.1066v1

Phys. Rev. B 77, 205123 (2008)

Physics

Condensed Matter

Strongly Correlated Electrons

8 pages, 6 figures

Scientific paper

10.1103/PhysRevB.77.205123

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.

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