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Leakage current through epitaxial BaTiO_3 films was investigated to clarify the difference between the characteristics of nanometer and millimeter-size metal contacts. SrTiO_3:Nb bottom electrode reve...aled genuine properties of a single metal/BaTiO_3 contact and demonstrated that breakdown voltage and leakage current density at both nanometer and millimeter-size contacts were controlled by the Schottky barrier. However, in marked contrast with millimeter-size contacts, nanometer-size contacts conducted little current below breakdown voltage and repeatedly exhibited abrupt breakdowns having a giant current density >10 A mm^2. The breakdown field was as high as 0.45 MV cm^1 at the forward bias, while no breakdown occurred up to 0.5 MV cm^1 at the reverse bias.続きを見る
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Mendeley出力
