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Resistance Steps and Asymmetric Conduction Induced by Currents in {\rm La}_{0.8}{\rm Ca}_{0.2}{\rm MnO}_{3} Films

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3 Author(s)
Jianfeng Wang ; Dept. of Phys., Univ. of Hong Kong, Hong Kong, China ; Ju Gao ; Lin Wang

A constant voltage mode of a power supply was adopted to study the current-induced effects in La0.8Ca0.2MnO3 epitaxial thin films. After processed by a current of the density of ~3 × 105 A/cm2 for 1 minute, they exhibited anisotropic conduction. Like the behavior of p-n junctions, the current starts to increase dramatically in the forward direction at a threshold voltage (opening voltage Vop), e.g., ~2.3 V at 30 K. For a processing with extending duration, the resistance while processing dropped from 10 k¿ to 2 k¿. Current voltage curves measured following such a step showed more stable asymmetric characteristics and substantial reduction of Vop, which is ~0.8 V at 290 K and ~1.6 V at 50 K. Our results are useful for revealing the origin of asymmetric conduction induced by current and for potential application.

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Magnetics, IEEE Transactions on  (Volume:46 ,  Issue: 6 )