Current-induced switching from a metallic to an insulating state is observed in phase-separated states of (La_1-yPry)0.7Ca0.3MnO₃ ($y=0.7$) and Nd0.5Ca0.5Mn_1-zCrzO₃ ($z=0.03$) crystals. The application of magnetic fields to this current-induced insulating state causes a pronounced low-field negative magnetoresistance effect [ρ(H)/ρ(0)=10^-3 at H=1 kOe]. The application of a constant voltage also causes the breakdown of the Ohmic relation above a threshold voltage. At voltages higher than this threshold value, oscillations in currents are observed. This oscillation is well reproduced by a simple model of local switching of a percolative conduction path.
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Tokunaga et al. (2005) studied this question.
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