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We investigate the magnetic field dependence of the physical properties off^2-configuration systems with a crystalline-electric field (CEF) singletground state, which gives rise to a non- Fermi liquid (NFL) fixed point due tothe competition between the Kondo-Yosida singlet and CEF singlet states. On thebasis of the numerical renormalization group method, we find that the magneticfield breaks this NFL fixed point via two mechanisms: one causing thepolarization of f-electrons and the other giving the "channel" anisotropy.These two mechanisms induce a difference in the magnetic field dependence ofthe characteristic temperature T_F^{*}(H), the crossover temperature from NFLto Fermi-liquid behavior. While the polarization of f-electrons givesT_F^{*}(H) \propto H^x (x\sim2.0), the "channel" anisotropy gives theH-independent T_F^{*}(H). These two mechanisms cross over continuously atapproximately the crossover magnetic field H_c, where an anomalous H-dependenceof T_F^{*}(H) appears. Such T_F^{*}(H) well reproduces the NFL behaviorsobserved in Th_{1-x}U_xRu_2Si_2. We also find that the H-dependence of theresistivity and the magnetic susceptibility are in good agreement with theexperimental results of this material. These results suggest that the NFLbehaviors observed in Th_{1-x}U_xRu_2Si_2 can be understood if this material islocated in the CEF singlet side near the critical phase boundary between thetwo singlet states.

journal of the physical society of japan

Magnetic Field Effect on Crossover Temperature from Non-Fermi Liquid to  Fermi Liquid Behavior in f^2-Impurity Systems with Crystalline-Electric-Field  Singlet State Competing with Kondo-Yosida Singlet State