Coherence scale of the Kondo lattice

Abstract

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.

4 pages, 4 eps figures. Minor changes. To appear in Phys. Rev. Lett

References in corpus (1)

• Evidence for exhaustion in the conductivity of the infinite-dimensional periodic Anderson model

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