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The anomalous charge transport observed in some strongly correlated metalsraises questions as to the universal applicability of Landau Fermi liquidtheory. The coherence temperature $T_{FL}$ for normal metals is usually takento be the temperature below which $T^2$ is observed in the resistivity. Belowthis temperature, a Fermi liquid with well-defined quasiparticles is expected.However, metallic ruthenates in the Ruddlesden-Popper family, frequently shownon-Drude low-energy optical conductivity and unusual $\omega/T$ scaling,despite the frequent observation of $T^2$ dc resistivity. Herein we reporttime-domain THz spectroscopy measurements of several different high-qualitymetallic ruthenate thin films and show that the optical conductivity can beinterpreted in more conventional terms. In all materials, the conductivity hasa two-Drude peak lineshape at low temperature and a crossover to a one-Drudepeak lineshape at higher temperatures. The two-component low-temperatureconductivity is indicative of two well-separated current relaxation rates fordifferent conduction channels. We discuss three particular possibilities forthe separation of rates: (a) Strongly energy-dependent inelastic scattering;(b) an almost-conserved pseudomomentum operator that overlaps with the current,giving rise to the narrower Drude peak; (c) the presence of multiple conductionchannels that undergoes a crossover to stronger interband scattering at highertemperatures. None of these scenarios require the existence of exoticquasiparticles. The results may give insight into the possible significance ofHund's coupling in determining interband coupling in these materials. Ourresults also show a route towards understanding the violation of Matthiessen'srule in this class of materials and deviations from the "Gurzhi" scalingrelations in Fermi liquids.

Separated transport relaxation scales and interband scattering in SrRuO$_3$, CaRuO$_3$, and Sr$_2$RuO$_4$ thin films