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Type: Artigo de periódico
Title: Thermodynamic properties of the periodic Anderson model: X-boson treatment
Author: Franco, R
Figueira, MS
Foglio, ME
Abstract: We study the specific-heat dependence of the periodic Anderson model (PAM) in the limit of U=infinity employing the X-boson treatment in two different regimes of the PAM: the heavy fermion Kondo (HF-K) and the local magnetic moment regime (HF-LMM). We obtain a multiple peak structure for the specific heat in agreement with the experimental results as well as the increase of the electronic effective mass at low temperatures associated with the HF-K regime. The entropy per site at low T tends to zero in the HF-K regime, corresponding to a singlet ground state, and it tends to k(B)ln 2 in the HF-LMM, corresponding to a doublet ground state at each site. The linear coefficient gamma(T)=C-v(T)/T of the specific heat qualitatively agrees with the experimental results obtained for different materials in the two regimes considered here.
Country: EUA
Editor: American Physical Soc
Rights: aberto
Identifier DOI: 10.1103/PhysRevB.68.205108
Date Issue: 2003
Appears in Collections:Unicamp - Artigos e Outros Documentos

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