Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2008-06-10
Physics
Condensed Matter
Strongly Correlated Electrons
Scientific paper
10.1209/0295-5075/84/57011
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.
Li Jing-Qian
Ma Caiwen
Qin Y. B.
Tian H. F.
Yang Han-Xin
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