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A strong departure from Landau-Fermi liquid (LFL) behavior have been recentlyrevealed in observed anomalies in both the magnetic susceptibility $\chi$ andthe muon and $\rm ^{63}Cu$ nuclear spin-lattice relaxation rates $1/T_1$ of${\rm {YbCu_{5-x}Au_x}}$ ($x=0.6$). We show that the above anomalies along withmagnetic-field-induced reentrance of LFL properties are indeed determined bythe scaling behavior of the quasiparticle effective mass. We obtain the scalingbehavior theoretically utilizing our approach based on fermion condensationquantum phase transition (FCQPT) notion. Our theoretical analysis ofexperimental data on the base of FCQPT approach permits not only to explainabove two experimental facts in a unified manner, but to clarify the physicalreasons for a scaling behavior of the longitudinal magnetoresistance in $\rmYbRh_2Si_2$.

Magnetic-field-induced reentrance of Fermi-liquid behavior and spin-lattice relaxation rates in YbCu_{5-x}Au_x