Anomalous spin scattering effects in the badly metallic itinerant ferromagnet SrRuO₃

SrRuO₃ is an itinerant ferromagnet with T_c ∼ 150K. 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 → T⁺_c with critical exponents higher than 0.9 and very weak divergence as 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 SrRuO₃ is an inherently bad metal.