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Magnetic susceptibility in a heavy fermion systemis composed of the Pauliterm (\chi_P) and the Van-Vleck term (\chi_V). The latter comes from theinterband excitation, where f-orbital degeneracy is essential. In this work, westudy \chi_P and \chi_V in the orbitally degenerate (J=5/2) periodic Andersonmodel for both the metallic and insulating cases. The effect of the correlationbetween f-electrons is investigated using the self-consistent second-orderperturbation theory. The main results are as follows. (i) Sixfold degeneratemodel: both \chi_P and \chi_V are enhanced by a factor of 1/z (z is therenormalization constant). (ii) Nondegenerate model: only \chi_P is enhanced by1/z. Thus, orbital degeneracy is indispensable for enhancement of \chi_V.Moreover, orbital degeneracy reduces the Wilson ratio and stabilizes anonmagnetic Fermi liquid state.Comment: 4 pages, revtex, to be published in J. Phys. Soc. Jpn. (No.8

Electronic State and Magnetic Susceptibility in Orbitally Degenerate (J=5/2) Periodic Anderson Model