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 small star, filled. At low conduction electron density n(c) ("exhaustion" limit), the ratio T small star, filled/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.
Highlights
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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 conclusion was that two scales are present in the Kondo lattice, with the coherence scale with T ⋆ ≪ TK in the “exhaustion” regime
Summary
Physical Review Letters, American Physical Society, 2000, 85 (5), pp.1048-1051. HAL is a multi-disciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L’archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d’enseignement et de recherche français ou étrangers, des laboratoires publics ou privés. Distributed under a Creative Commons Attribution| 4.0 International License arXiv:cond-mat/0004043v2 [cond-mat.str-el] 22 Jun 2000
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