Realization of Heavy Local Fermi Liquid and Non-Fermi Liquid in f2 Crystalline-Electric-Field Singlet-Triplet Configuration
Abstract
Using the numerical renormalization group method, we investigate an extended Anderson model, in which correlated electrons with the 1(singlet)-4(triplet) f2 crystalline-electric-field (CEF) configuration hybridize with conduction electrons of 7(doublet) and 8 (quartet) under cubic Oh symmetry, from a strong spin-orbit interaction limit. For the case of the parameters relevant to PrFe4P12, the system is under competition between the CEF singlet fixed point and the multichannel Kondo non-Fermi liquid fixed point arising from the quadrupolar coupling between the impurity with pseudospin 1 and the conduction electron with pseudospin 3/2 . We consider that this result reveals the origin of the heaviness of the effective mass and non-Fermi liquid behavior of the Pr- based filled skutterudite compounds.
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