${\mathrm{SrRuO}}_3$ is an itinerant ferromagnet with $T_c\sim 150\mathrm{K}$. While the magnetization shows critical behavior that is well fit with universal critical exponents, the temperature derivative of the resistivity shows an unusually strong divergence as $T\to T_c^{+}$ with critical exponents higher than 0.9 and very weak divergence as $T\to T_c^{-}$. At low temperatures, the resistivity rapidly increases with temperature, and an unusual correlation with magnetization is found. We argue that the two phenomena stem from the fact that ${\mathrm{SrRuO}}_3$ is an inherently bad metal.

• Received 6 May 1996

DOI:https://doi.org/10.1103/PhysRevLett.77.2774