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Using the numerical renormalization group method, we investigate an extendedAnderson model, in which correlated electrons with the$\Gamma_1$(singlet)-$\Gamma4$(triplet) f$^2$ crystalline-electric-field (CEF)configuration hybridize with conduction electrons of $\Gamma_7$(doublet) and$\Gamma_8$ (quartet) under cubic $O_h$ symmetry, from a strong spin-orbitinteraction limit. For the case of the parameters relevant to PrFe4P12, thesystem is under competition between the CEF singlet fixed point and themultichannel  Kondo non-Fermi liquid fixed point arising from the quadrupolar couplingbetween the impurity with pseudospin 1 and the conduction electron withpseudospin 3/2 . We consider that this result reveals the origin of theheaviness of the effective mass and non-Fermi liquid behavior of the Pr- basedfilled skutterudite compounds.Comment: 9 pages, 5 figure

Realization of Heavy Local Fermi Liquid and Non-Fermi Liquid in f2 Crystalline-Electric-Field Singlet–Triplet Configuration

Realization of Heavy Local Fermi Liquid and Non-Fermi Liquid in f² Crystalline-Electric-Field Singlet–Triplet Configuration