We have demonstrated a strain-induced metal-insulator transition for weak Jahn-Teller effects in a t 2g electron system of Sm 0.5 Ca 0.5 TiO 3 , which has metallic ground states in the bulk. A clear variation of electronic properties in Sm 0.5 Ca 0.5 TiO 3 thin films was investigated as a function of epitaxial stain by changing a substrate and the film thickness. Under strong biaxial tensile strain, metallic behaviors were completely eliminated, as evidenced by the temperature dependence of resistivity. The observed metal-insulator transition was consistent with the behavior of the Ti 3d density of states at the Fermi level seen in valence band hard x-ray photoemission spectra.
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