Intersite coupling effects in a Kondo lattice
  The La dilution of the Kondo lattice CeCoIn_5 is studied. The scaling laws found for the magnetic susceptibility and the specific heat reveal two well-separated energy scales, corresponding to the single impurity Kondo temperature T_K and an intersite spin-liquid temperature T^*. The Ce-dilute alloy has the expected Fermi liquid ground state, while the specific heat and resistivity in the dense Kondo regime exhibit non-Fermi-liquid behavior, which scales with T^*. These observations indicate that the screening of the magnetic moments in the lattice involves antiferromagnetic intersite correlations with a larger energy scale in comparison with the Kondo impurity case. 
S. Nakatsuji, S. Yeo, L. Balicas, Z. Fisk, P. Schlottmann, P.G.   Pagliuso, N.O. Moreno, J.L. Sarrao, and J.D. Thompson