2000/04/30 by S. Burdin, A. Georges, D. R. Grempel · 1 citation
Physics and Astronomy · #cond-mat.str-el
paper · pdf · doi:10.1103/physrevlett.85.1048
4 pages, 4 eps figures. Minor changes. To appear in Phys. Rev. Lett
arxiv created 2000/06/22 · arxiv updated 2009/11/30
It is shown that the large-N approach yields two energy scales for the Kondo lattice model. The single-impurity Kondo temperature, TK, signals the onset of local singlet formation, while Fermi liquid coherence sets in only below a lower scale, T⋆. At low conduction electron density nc ("exhaustion" limit), the ratio T⋆/TK is much smaller than unity, and is shown to depend only on nc and not on the Kondo coupling. The physical meaning of these two scales is demonstrated by computing several quantities as a function of nc and temperature.