Magnetic behavior of the Kondo-lattice system CeRu2Si2

We demonstrate experimentally that the intermetallic compound Ce${\mathrm{Ru}}_2$ ${\mathrm{Si}}_2$ exhibits low-temperature magnetic properties similar to those of the heavy-fermion superconductor Ce${\mathrm{Cu}}_2$ ${\mathrm{Si}}_2$. Magnetic susceptibility and ${}_{}{}^{29}{}_{}{}^{}\mathrm{Si}$ nuclear magnetic resonance (NMR) measurements establish that the ground state of Ce${\mathrm{Ru}}_2$ ${\mathrm{Si}}_2$ is nonmagnetic, and electrical resistivity measurements reflect Kondo-type spin fluctuations. The observed proportionality between the Ce contributions to the ${}_{}{}^{29}{}_{}{}^{}\mathrm{Si}$ NMR shift $K$ and the magnetic susceptibility $\chi$ distinguishes Ce${\mathrm{Ru}}_2$ ${\mathrm{Si}}_2$ from mixed-valence Ce- and Yb-based systems found previously to exhibit anomalous nonlinear dependence of $K$ on $\chi$.