Abstract
Within the framework of slave-boson mean-field theory, we study the thermodynamic properties of the periodic Anderson lattice model with half-filled conduction band and one 4f electron at each primitive cell and the degeneracy . It is found that after taking into account the direct nearest-neighbor hopping, such a periodic Anderson lattice model can exhibit both an insulating ground state and a heavy-fermion metal ground state depending on the value of the bare energy level , the hybridization matrix element , and the direct hopping strength . This is unlike the case neglecting the direct hopping, in which such a periodic Anderson lattice model will predict an insulating ground state only.
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