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VOLUME 85 (2007) | ISSUE 8 | PAGE 484
Universal behavior of CePd1-xRhx Ferromagnet at Quantum Critical Point
PACS: 71.27.+a, 74.20.Fg, 74.25.Jb
Abstract
The heavy-fermion metal CePd1-xRhx can be tuned from ferromagnetism at x=0 to non-magnetic state at some critical concentration xc. The non-Fermi liquid behavior (NFL) at x\simeq x_c is recognized by power low dependence of the specific heat C(T) given by the electronic contribution, susceptibility χ(T) and volume expansion coefficient α(T) at low temperatures: C/T\propto\chi(T)\propto\alpha(T)/T\propto1/\sqrt{T}. We also demonstrate that the behavior of normalized effective mass M*N observed in CePd1-xRhx at x\simeq 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-xRhx can be accounted for within frameworks of quasiparticle picture and fermion condensation quantum phase transition, while this alloy exhibits a universal thermodynamic NFL behavior which is independent of the characteristic features of the given alloy such as its lattice structure, magnetic ground state, dimension etc.