Phase diagram of the Kondo necklace: a mean-field renormalization group approach

Details Phase diagram of the Kondo necklace: a mean-field renormalization group approach Phase diagram of the Kondo necklace: a mean-field renormalization group approach

2001-06-21

arxiv.org/abs/cond-mat/0106419v1

Physics

Condensed Matter

Strongly Correlated Electrons

5 figures

Scientific paper

10.1088/0305-4470/34/49/306

In this paper we investigate the magnetic properties of heavy fermions in the antiferromagnetic and dense Kondo phases in the framework of the Kondo necklace model. We use a mean field renormalization group approach to obtain a temperature versus Kondo coupling $(T-J)$ phase diagram for this model in qualitative agreement with Doniach's diagram, proposed on physical grounds. We further analyze the magnetically disordered phase using a two-sites approach. We calculate the correlation functions and the magnetic susceptibility that allow to identify the crossover between the spin-liquid and the local moment regimes, which occurs at a {\em coherence} temperature.

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