Comparison of CeRh2Si2 and CeRh2−xRuxSi2 near their Magnetic-Nonmagnetic Boundaries

Abstract

A zero-temperature magnetic-nonmagnetic phase boundary is accessed in CeR${\mathrm{h}}_2$S${\mathrm{i}}_2$ by application of pressure and in ${\mathrm{CeRh}}_{2-x}{\mathrm{Ru}}_x{\mathrm{Si}}_2$ at ambient pressure for $x\approx 1.0$. A comparison of specific heat and resistivity measurements in the two cases emphasizes the importance of disorder in producing non-Fermi-liquid-like behavior in these as well as in other Ce-based systems.