Kondo screening and exhaustion in the periodic Anderson model

Abstract

We investigate the paramagnetic periodic Anderson model using the dynamical mean-field theory in combination with the modified perturbation theory which interpolates between the weak and strong coupling limits. For the symmetric PAM, the ground state is always a singlet state. However, as function of the hybridization strength, a crossover from collective to local Kondo screening is found. Reducing the number of conduction electrons, the local Kondo singlets remain stable. The unpaired f-electrons dominate the physics of the system. For very low conduction electron densities, a large increase of the effective mass of the quasiparticles is visible, which is interpreted as the approach of the Mott-Hubbard transition.

10 pages, 8 figures, accepted by Phys. Rev. B

References in corpus (3)

• "Exhaustion" Physics in the Periodic Anderson Model using Iterated Perturbation Theory
• Evidence for exhaustion in the conductivity of the infinite-dimensional periodic Anderson model
• The asymmetric single-impurity Anderson model - the modified perturbation theory

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