Non-Fermi liquid behavior and scaling of low frequency suppression in optical conductivity spectra of CaRuO${}_3$

Abstract

Optical conductivity spectra ${\sigma }_1(\omega )$ of paramagnetic CaRuO${}_3$ are investigated at various temperatures. At T=10 K, it shows a non-Fermi liquid behavior of ${\sigma }_1(\omega )\sim 1/{\omega }^{\frac{1}{2}}$, similar to the case of a ferromagnet SrRuO${}_3$. As the temperature ($T$) is increased, on the other hand, ${\sigma }_1(\omega )$ in the low frequency region is progressively suppressed, deviating from the $1/ω^{\frac 12%}$-dependence. Interestingly, the suppression of ${\sigma }_1(\omega )$ is found to scale with $\omega /T$ at all temperatures. The origin of the scaling behavior coupled with the non-Fermi liquid behavior is discussed.

arXiv comment4 pages, 3 figures

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