Nonlinear current-voltage behavior and electrically driven phase transition in charge frustrated LuFe2O4

Abstract

Electric transport measurements of the charge frustrated LuFe2O4, in which the charge ordering (CO) and electronic ferroelectricity are found, reveal strong nonlinear electric conduction upon application of electrical field in both single crystalline and polycrystalline samples. The threshold electric fields (Et) in single crystalline LuFe2O4 are estimated respectively to be about 60V/cm and 10V/cm with E parallel and perpendicular to the c-axis direction. Experimental measurements also demonstrate that the I-V nonlinearity increases quickly with lowering temperature. Furthermore, our in-situ TEM investigations evidently reveal that the nonlinear I-V behavior is intrinsically in correlation with a current driven charge ordering insulator-metal transition, and the applied electrical field triggers a visible CO collapse recognizable as the fading of satellite spots of the CO modulations.

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• Robust charge and magnetic order under electric field and current in the multiferroic LuFe(2)O(4)
• Ferroelectric and Magnetic Domains in LuFe2O4 Observed by Scanning Probe Microscopy
• Photoluminescence in electronic ferroelectric Er_{1-x}Yb_xFe_2O_4