Effect of crystalline electric field on heavy fermions:: Fermi liquid state with f2-singlet configuration

Fermi liquid description of heavy Fermions with the f(0) - f(1) - f(2) configuration is studied by using the slave boson technique. In particular, it is shown that a new type of Fermi liquid state is realized in the case where the f(2) configuration with a singlet crystal field ground state is predominant. Namely, the quasiparticle contribution chi(qp) to the magnetic susceptibility is not enhanced while the density of states of quasiparticle is enhanced producing the heavy Fermions. A relevance to an anomalously small reduction of the Knight shift across the superconducting transition observed in UPt3 is discussed.