Journal Article Strain-induced metal-insulator transition in <i>t</i><sub>2g</sub> electron system of perovskite titanate Sm<sub>0.5</sub>Ca<sub>0.5</sub>TiO<sub>3</sub> filmss

吉松, 公平  ,  Yoshimatsu, Kohei  ,  岡部, 宏和  ,  Okabe, Hirokazu  ,  大島, 孝仁  ,  OSHIMA, Takayoshi  ,  上田, 茂典  ,  Ueda, Shigenori  ,  大友, 明  ,  Ohtomo, Akira

93 ( 19 )  , p.195159 , 2016-05 , American Physical Society
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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