Wilson and Kadowaki-Woods ratios in heavy fermions |
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Authors: | M.A. Continentino |
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Affiliation: | (1) Instituto de Fisica, Universidade Federal Fluminense, Campus da Praia Vermelha, Niterói, 24.210-340, RJ, Brazil, BR |
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Abstract: | Recently we have shown that a one-parameter scaling, , describes the physical behavior of several heavy fermions in a region of their phase diagram. In this paper we fully characterize this region, obtaining the uniform susceptibility, the resistivity and the specific heat in terms of the coherence temperature . This allows for an explicit evaluation of the Wilson and the Kadowaki-Woods ratios in this regime. These quantities turn out to be independent of the distance to the quantum critical point (QCP). The theory of the one-parameter scaling corresponds to a local interacting model. Although spatial correlations are irrelevant in this case, time fluctuations are critically correlated as a consequence of the quantum character of the transition. Received 23 December 1998 and Received in final form 10 June 1999 |
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Keywords: | PACS. 71.27.+a Strongly correlated electron systems heavy fermions - 75.30.Mb Valence fluctuation, Kondo lattice, and heavy-fermion phenomena - 71.10.Hf Non-Fermi-liquid ground states, electron phase diagrams and phase transitions in model systems |
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