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The aspect of the quasiparticle interaction of a local Fermi liquid, theimpurity version of f$^2$-based heavy fermions, is studied by the Wilsonnumerical renormalization group method. In particular, the case of thef$^2$-singlet crystalline-electric-field ground state is investigated assumingthe case of UPt$_3$ with the hexagonal symmetry. It is found that theinterorbital interaction becomes larger than the intraorbital one in contrastto the case of the bare Coulomb interaction for the parameters relevant toUPt$_3$. This result offers us a basis to construct a microscopic theory of thesuperconductivity of UPt$_3$ where the interorbital interactions are expectedto play important roles.Comment: 9 pages, 5 figure

Quasiparticle Interactions for f2-Impurity Anderson Model with Crystalline-Electric-Field: Numerical Renormalization Group Study

Quasiparticle Interactions for f²-Impurity Anderson Model with Crystalline-Electric-Field: Numerical Renormalization Group Study