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Article Dans Une Revue Physical Review Letters Année : 2000

Coherence Scale of the Kondo Lattice

Résumé

It is shown that the large-N approach yields two energy scales for the Kondo lattice model. The single-impurity Kondo temperature, $T_K$, signals the onset of local singlet formation, while Fermi liquid coherence sets in only below a lower scale, $T^{\star}$. At low conduction electron density $n_c$ ("exhaustion" limit), the ratio $T^{\star}/T_K$ is much smaller than unity, and is shown to depend only on $n_c$ and not on the Kondo coupling. The physical meaning of these two scales is demonstrated by computing several quantities as a function of $n_c$ and temperature.
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hal-01555976 , version 1 (05-07-2017)

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S. Burdin, A. Georges, D. R. Grempel. Coherence Scale of the Kondo Lattice. Physical Review Letters, 2000, 85 (5), pp.1048-1051. ⟨10.1103/PhysRevLett.85.1048⟩. ⟨hal-01555976⟩
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