Abstract
The electric current effects on (La,Ca)MnO 3 thin films epitaxially grown on SrTiO 3 and LaAlO 3 substrates were carefully investigated. When the applied electric current density exceeds a sample dependent critical value, apparent asymmetric I – V curves are clearly observed on the stimulated (La,Ca)MnO 3/SrTiO 3 films. The larger current and longer processed time enhance the asymmetry. No asymmetry was observed on all the (La,Ca)MnO 3/LaAlO 3 films independent of applied electric current and stimulated time. The comparison study indicates that the observed asymmetric I – V behavior of the (La,Ca)MnO 3/SrTiO 3 films is closely related to the electric field induced conductivity of the underlying SrTiO 3 substrates. We proposed an equivalent circuit to qualitatively explain our results. Our results also imply that in dealing with the electric current (field) effects on the thin films fabricated on SrTiO 3 substrates, the electric field induced conductivity of the substrates should be considered.
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