Conductance decreasing with increasing temperature (T) above a characteristic T (T0) is found in the reverse-diode characteristics of metal contacts on strained BaTiO3 epitaxial films. The conduction mechanisms below and above T0 near the Curie temperature of the bulk BaTiO3 are distinctly different. Marked similarities to these characteristics are found in the surface conduction on BaTiO3 single crystal in a high vacuum. By comparing the observations with the positive temperature coefficient of resistance (PTCR) effect in ceramics, we suggest that the anomaly is regarded as a PTCR effect at metal/ferroelectric contact, and discuss the origin of the effect in thin films and single crystals.
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Okano et al. (2003) studied this question.
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