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A Nonohmic Positive Temperature Coefficient of Resistance in Lattice-Matched and Lattice-Mismatched Epitaxial BaTiO3 Films

We report the finding of two new effects in the current conduction through ferroelectric films: a temperature-induced abrupt conductance change and an effect similar to the positive-temperature-coefficient-of-resistance (PTCR). Here, we use mostly the lattice-mismatched epitaxial heterostructure BaTiO 3 /(La,Sr)2CuO 4 . The results should provide an insight into the insulator-metal transition in insulators and the new class of the thin-film PTCR.