Magnetic and non-Fermi-liquid phases in Ce1-xYxRhIn5 -: art. no. 064405

We have investigated single-crystal samples of Ce1-xYxRhIn5 by means of specific heat C, magnetic susceptibility chi, and electrical resistivity rho measurements as a function of temperature T. As yttrium is substituted for cerium, the Neel temperature is suppressed, yielding a quantum critical point at yttrium concentration x(c)similar to0.38. Non-Fermi-liquid behavior (NFL) occurs in C(T) and chi(T) over an extended range of yttrium concentrations above the quantum critical point 0.4less than or equal toxless than or equal to0.9 with C(T) and chi(T) displaying power law T dependences at low temperatures. Remarkably, the NFL behavior become more pronounced with increasing distance from the quantum critical point. For the samples with 0.2less than or equal toxless than or equal to0.9 we also observe features in the specific heat and magnetic susceptibility above T-N that may be due to tetragonal crystalline electric field splitting of the Ce(3+)J=5/2 multiplet with a Gamma(7) ground state.