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The temperature ($T$) dependence of the optical conductivity spectra$\sigma(\omega)$ of a single crystal SrRuO$_3$ thin film is studied over a $T$range from 5 to 450 K. We observed significant $T$ dependence of the spectralweights of the charge transfer and interband $d$-$d$ transitions across theferromagnetic Curie temperature ($T_c$ ~ 150 K). Such $T$ dependence wasattributed to the increase in the Ru spin moment, which is consistent with theresults of density functional theory calculations. $T$ scans of $\sigma(\Omega,T)$ at fixed frequencies $\Omega$ reveal a clear $T^2$ dependence below $T_c$,demonstrating that the Stoner mechanism is involved in the evolution of theelectronic structure. In addition, $\sigma(\Omega, T)$ continues to evolve attemperatures above $T_c$, indicating that the local spin moment persists in theparamagnetic state. This suggests that SrRuO$_3$ is an intriguing oxide systemwith itinerant ferromagnetism.

Temperature Evolution of Itinerant Ferromagnetism in SrRuO3 Probed by Optical Spectroscopy