Gutzwiller method for an extended periodic Anderson model with the c-f Coulomb interaction

Kubo, Katsunori 

We study an extended periodic Anderson model with the Coulomb interaction between the conduction and f electrons by the Gutzwiller method. The crossovers between the Kondo, intermediate-valence, and almost empty f-electron regimes become sharp by , and for a sufficiently large , these crossovers become first-order phase transitions. In the Kondo regime, a large enhancement in the effective mass occurs as in the ordinary periodic Anderson model without . In addition, we find that a large mass enhancement occurs also in the intermediate-valence regime by an effect of .