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In this paper we investigate the magnetic properties of heavy fermions in theantiferromagnetic and dense Kondo phases in the framework of the Kondo necklacemodel. We use a mean field renormalization group approach to obtain atemperature versus Kondo coupling $(T-J)$ phase diagram for this model inqualitative agreement with Doniach's diagram, proposed on physical grounds. Wefurther analyze the magnetically disordered phase using a two-sites approach.We calculate the correlation functions and the magnetic susceptibility thatallow to identify the crossover between the spin-liquid and the local momentregimes, which occurs at a {\em coherence} temperature.Comment: 5 figure

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