Current oscillation and low-field colossal magnetoresistance effect in phase-separated manganites
Abstract
Current-induced switching from metallic to insulating state is observed in phase-separated states of (La1-yPry)0.7Ca0.3MnO3 (y=0.7) and Nd0.5Ca0.5Mn1-zCrzO3 (z=0.03) crystals. Application of magnetic fields to this current-induced insulating state causes pronounced low-field negative magnetoresistance effect [r(H)/r(0)=10-3 at H=1kOe]. Application of a constant voltage also causes breakdown of 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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