Abstract
SmO (001) epitaxial thin films were grown on $\mathrm{YAl}{\mathrm{O}}_{3}$ (110) substrates by pulsed laser deposition method. X-ray photoemission spectroscopy indicated coexistence of $\mathrm{S}{\mathrm{m}}^{2+}$ and $\mathrm{S}{\mathrm{m}}^{3+}$, suggesting a valence fluctuating state. A SmO thin film showed a metallic conductionlike SmO polycrystal in a previous study. However, a SmO thin film showed nonmonotonical temperature dependence at low temperature in contrast with the polycrystal. A local resistivity minimum was observed at 16 K, probably caused by the dense Kondo effect, and the resistivity below 2 K was proportional to ${T}^{2}$. These features suggest the heavy-fermionic nature of SmO.
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