Non-Fermi liquid behavior of SrRuO_3 -- evidence from infrared   conductivity
  The reflectivity of the itinerant ferromagnet SrRuO_3 has been measured between 50 and 25,000 cm-1 at temperatures ranging from 40 to 300 K, and used to obtain conductivity, scattering rate, and effective mass as a function of frequency and temperature. We find that at low temperatures the conductivity falls unusually slowly as a function of frequency (proportional to \omega^{-1/2}), and at high temperatures it even appears to increase as a function of frequency in the far-infrared limit. The data suggest that the charge dynamics of SrRuO_3 are substantially different from those of Fermi-liquid metals. 
P. Kostic, Y. Okada, Z. Schlesinger (U.C., Santa Cruz), J. W. Reiner,   L. Klein, A. Kapitulnik, T. H. Geballe, M. R. Beasle...