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We study an extended periodic Anderson model with the Coulomb interaction Ucfbetween conduction and f electrons by the Gutzwiller method. The crossoversbetween the Kondo, intermediate-valence, and almost empty f-electron regimesbecome sharper with Ucf, and for a sufficiently large Ucf, become first-orderphase transitions. In the Kondo regime, a large enhancement in the effectivemass occurs as in the ordinary periodic Anderson model without Ucf. Inaddition, we find that a large mass enhancement also occurs in theintermediate-valence regime by the effect of Ucf.

Gutzwiller Method for an Extended Periodic Anderson Model with the c-f Coulomb Interaction