Abstract

Heavy fermion systems (HFS) are described by the periodic Anderson model (PAM), which is studied within the dynamical mean-field theory (DMFT), mapping the PAM on an effective single-impurity Anderson model (SIAM) to be determined selfconsistently, which becomes exact in the limit of high spatial dimensions, d → ∞. We use the modified perturbation theory (MPT) as approximation for the effective SIAM. The MPT is exact up to second order in the Coulomb correlation U and simultaneously reproduces the exact results for the atomic limit and the lowest moments. Within this approximation we have calculated the temperature dependence of the resistivity, the thermopower and the frequency and temperature dependence of the dynamical conductivity. For all these quantities the typical HFS-behavior is qualitatively well reproduced within our treatment.Key wordsHeavy FermionsResistivityThermo (electric) PowerTemperature Dependence of Transport QuantitiesPeriodic Anderson ModelDynamical Mean-Field TheoryModified Perturbation TheoryDynamical Conductivity

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