Abstract
The heavy-fermion metal CePd1−x Rh x can be tuned from ferromagnetism at x = 0 to the nonmagnetic state at some critical concentration x c . The non-Fermi liquid behavior (NFL) at x ≃ x c is recognized by the power-law dependence of the specific heat C(T) given by the electronic contribution susceptibility X(T) and volume expansion coefficient α(T) at low temperatures: C/T ∝ X(T) ∝ α(T)/T∝ 1/ √T. We also demonstrate that the behavior of the normalized effective mass M *N observed in CePd1−x Rh x at x ≃ 0.8 agrees with that of M * N observed in paramagnetic CeRu2Si2 and conclude that these alloys exhibit the universal NFL thermodynamic behavior at their quantum critical points. We show that the NFL behavior of CePd1−x Rh x can be accounted for within the frameworks of the quasiparticle picture and fermion condensation quantum phase transition, while this alloy exhibits a universal thermodynamic NFL behavior that is independent of the characteristic features of the given alloy such as its lattice structure, magnetic ground state, dimension, etc.
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