Low Energy Scales of Kondo Lattices: Mean-field Perspective
A review of the low temperature properties of Kondo lattice systems is presented within the mean-field approximation, focusing on the different characteristic energy scales. The Kondo temperature, T K , and the Fermi liquid coherence energy, T0, are analyzed as functions of the electronic filling, the shape of the non-interacting density of states, and the concentration of magnetic moments. These two scales can vanish, corresponding to a breakdown of the Kondo effect when an external magnetic field is applied. The Kondo breakdown can also be reached by adding a superexchange term to the Kondo lattice model, which mimics the intersite magnetic correlations neglected at the mean-field level.
KeywordsFermi Liquid Kondo Effect Kondo Temperature Kondo Lattice Kondo Lattice Model
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