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We have prepared high-quality epitaxial thin films of CaRuO$_3$ with residualresistivity ratios up to 55. Shubnikov-de Haas oscillations in themagnetoresistance and a $T^2$ temperature dependence in the electricalresistivity only below 1.5 K, whose coefficient is substantially suppressed inlarge magnetic fields, establish CaRuO$_3$ as a Fermi liquid (FL) withanomalously low coherence scale. Non-Fermi liquid (NFL) $T^{3/2}$ dependence isfound between 2 and 25 K. The high sample quality allows access to theintrinsic electronic properties via THz spectroscopy. For frequencies below 0.6THz, the conductivity is Drude-like and can be modeled by FL concepts, whilefor higher frequencies non-Drude behavior, inconsistent with FL predictions, isfound. This establishes CaRuO$_3$ as a prime example of optical NFL behavior inthe THz range.

Low-energy electronic properties of clean CaRuO$_3$: elusive Landau quasiparticles