Low-energy properties of the Kondo lattice model

Details Low-energy properties of the Kondo lattice model Low-energy properties of the Kondo lattice model

2010-12-10

arxiv.org/abs/1012.2255v1

J. Phys.: Condens. Matter 23 094212 (2011)

Physics

Condensed Matter

Strongly Correlated Electrons

11 pages, 7 figures

Scientific paper

10.1088/0953-8984/23/9/094212

We study the zero-temperature properties of the Kondo lattice model within the dynamical mean-field theory. As impurity solver we use the numerical renormalization group. We present results for the paramagnetic case showing the anticipated heavy Fermion physics, including direct evidence for the appearance of a large Fermi surface for antiferromagnetic exchange interaction. Allowing for the formation of a Neel state, we observe at finite doping an antiferromagnetic metal below a critical exchange interaction, which shows a crossover from a local-moment antiferromagnet with a small Fermi surface for weak exchange coupling to a heavy-fermion antiferromagnet with a large Fermi surface for increasing exchange. Including lattice degrees of freedom via an additional Holstein term we observe a significant suppression of the Kondo effect, leading to strongly reduced lowenergy scale. For too large electron-phonon coupling we find a complete collaps of the heavy Fermi liquid and the formation of polarons.

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