Abstract La0.67Ca0.33MnO3 thin films are fabricated on fluorine-doped tin oxide conducting glass substrates by a pulsed laser deposition technique with SrTiO3 used as a buffer layer. The current-voltage characteristics of the heterojunctions exhibit an asymmetric and resistance switching behaviour. A homogeneous interface-type conduction mechanism is also reported using impedance spectroscopy. The spatial homogeneity of the charge carrier distribution leads to field-induced potential-barrier change at the Au-La0.67Ca0.33MnO3 interface and a concomitant resistance switching effect. The ratio of the high resistance state to the low resistance state is found to be as high as 1.3?104% by simulating the AC electric field. This colossal resistance switching effect will greatly improve the signal-to-noise ratio in nonvolatile memory applications.
(Conductivity phenomena in semiconductors and insulators)
Fund: Project supported by the National Natural Science Foundation of China (Grant No. 60976016), the Program for Innovative Research Team in Science and Technology in University of Henan Province (IRTSTHN), China (Grant No. 2012IRTSTHN004), and the Research Program of Henan University, China (Grant No. SBGJ090503).
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