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We investiaged the optical properties of four-layer BaRuO$_{3}$, which showsa fermi-liquid-like behavior at low temperature. Its optical conductivityspectra clearly displayed the formation of a pseudogap and the development of acoherent peak with decreasing temperature. Temperature-dependences of thedensity $n$ and the scattering rate $1/\tau$ of the coherent component werealso derived. As the temperature decreases, both $n$ and $1/\tau$ decrease forfour-layer BaRuO$_{3}$. These electrodynamic responses were compared with thoseof nine-layer BaRuO$_{3}$, which also shows a pseudogap formation but has aninsulator-like state at low temperature. It was found that the relative ratesof change of both $n$ and $1/\tau$ determine either metallic or insulator-likeresponses in the ruthenates. The optical properties of the four-layer ruthenatewere also compared with those of other pseudogap systems, such as high $T_{c}$cuprates and heavy electron systems.Comment: 7 figures. submitted to Phys. Rev.

physical review. b, condensed matter

Pseudogap formation in four-layer<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">BaRuO</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>and its electrodynamic response changes

Pseudogap formation in four-layerBaRuO3and its electrodynamic response changes