Effects of the nearest-neighbor coulomb interactions on the ground state of the periodic anderson model

Abstract

The magnetic and nonmagnetic ground states of the periodic Anderson model with Coulomb interaction between f electrons on the nearest-neighbor (NN) sites are investigated using a variational method, which gives an exact calculation of the expectation values in the limit of infinite dimensions. It is shown that for a critical value of NN Coulomb interactions the magnetic ground state of the periodic Anderson model in the Kondo regime is unstable. Factors in terms of the physical processes responsible for instability of the magnetic ground state are also discussed. Our study indicates the importance of the NN Coulomb interactions for correlated two-band models.