Susceptibility inhomogeneity and non-Fermi-liquid behavior in $\mathrm{Ce}({\mathrm{Ru}}_{0.5}{\mathrm{Rh}}_{0.5}{)}_2{\mathrm{Si}}_2$

Magnetic susceptibility and muon spin rotation $\left(\mu \mathrm{SR}\right)$ experiments have been carried out to study the effect of structural disorder on the non-Fermi-liquid (NFL) behavior of the heavy-fermion alloy $\mathrm{Ce}({\mathrm{Ru}}_{0.5}{\mathrm{Rh}}_{0.5}{)}_2{\mathrm{Si}}_2.$ Analysis of the bulk susceptibility in the framework of disorder-driven Griffiths-phase and Kondo-disorder models for NFL behavior yields relatively narrow distributions of characteristic spin-fluctuation energies, in agreement with $\mu \mathrm{SR}$ linewidths that give the inhomogeneous spread in susceptibility. $\mu \mathrm{SR}$ and NMR data both indicate that disorder explains the “nearly NFL” behavior observed above $\sim 2\hspace{0.5em}\mathrm{K},$ but does not dominate the NFL physics found at low temperatures and low magnetic fields.