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Phys Rev Lett. 2002 Sep 2;89(10):106402. Epub 2002 Aug 14.

Intersite coupling effects in a kondo lattice.

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1
National High Magnetic Field Laboratory (NHMFL), Florida State University, Tallahassee 32310, USA.

Abstract

The La dilution of the Kondo lattice CeCoIn5 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.

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