Thermodynamic properties of the periodic Anderson model:X-boson treatment

Details Thermodynamic properties of the periodic Anderson model:X-boson treatment Thermodynamic properties of the periodic Anderson model:X-boson treatment

2003-01-23

arxiv.org/abs/cond-mat/0301438v3

Physics

Condensed Matter

Strongly Correlated Electrons

9 pages, 14 figures

Scientific paper

10.1103/PhysRevB.68.205108

We study the specific dependence of the periodic Anderson Model (PAM) in the limit of $U=\infty$ employing the X-boson treatment in two fifferent regimes of the PAM: the heavy fermion Kondo (HF-K) and the heavy fermion local magnetic regime (HF-LMM). We obtain a multiple peak structure for the specific heat in agreement with 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 $\gamma(T)=C_{v}/T$ of the specific heat qualitatively agrees with the experimental results obtained for differents materials in the two regimes considered here.

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