Possible non-Fermi-liquid behavior of ${\mathrm{CaRuO}}_3$

We measured the resistivity $\left(\rho \right)$ and magnetoresistance $(\Delta \rho /\rho )$ of the metallic pseudocubic perovskite ${\mathrm{CaRuO}}_3.$ At high temperatures, $\rho {=a+bT}^{0.5}$ and $\Delta \rho /\rho$ is negative. At low temperatures, $\rho {=a+bT}^{1.5}$ and $\Delta \rho /\rho$ changes sign as a function of the applied magnetic field. Both at high temperatures and at low temperatures, $\rho$ deviates strongly from the resistivity of Fermi-liquid metals; we therefore discuss the possibility that ${\mathrm{CaRuO}}_3$ is a non-Fermi-liquid metal.