  It is shown by the Wilson numerical renormalization group method that a
strongly correlated impurity with a crystalline-electric-field singlet ground
state in the f^2-configuration exhibits an anomalous local Fermi liquid state
in which the static magnetic susceptibility remains an uncorrelated value while
the NMR relaxation rate is enhanced in proportion to the square of the mass
enhancement factor. Namely, the Korringa-Shiba relation is apparently broken.
This feature closely matches the anomalous behaviors observed in UPt_3, i.e.,
the coexistence of an unenhanced value of the Knight shift due to
quasiparticles contribution (the decrease across the superconducting
transition) and the enhanced relaxation rate of NMR. Such an anomalous Fermi
liquid behavior suggests that the Fermi liquid corrections for the
susceptibility are highly anisotropic.
