Phys. Rev. Lett. 85, 1048–1051 (2000)Coherence Scale of the Kondo LatticeReceived 6 April 2000; published in the issue dated 31 July 2000 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. © 2000 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.85.1048
DOI:
10.1103/PhysRevLett.85.1048
PACS:
71.27.+a, 71.10.Fd, 71.20.Eh
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