Volume 84, Number 5, December 2008
|Number of page(s)||5|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||16 December 2008|
Nonlinear current-voltage behavior and electrically driven phase transition in charge-frustrated LuFe2O4
Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences - Beijing 100190, PRC
2 Department of Physics, Tsinghua University - Beijing 100084, PRC
Corresponding author: LJQ@aphy.iphy.ac.cn
Accepted: 3 November 2008
Electric transport measurements of the charge-frustrated LuFe2O4, in which charge ordering (CO) and electronic ferroelectricity are found, reveal a strong nonlinear electric conduction upon application of electric fields in both single-crystalline and polycrystalline samples. The threshold electric fields in LuFe2O4 are estimated to be about 60 V/cm and 10 V/cm with E parallel and perpendicular to the c-axis direction, respectively. Experimental measurements also demonstrate that the I-V nonlinearity increases quickly with decreasing temperature. Furthermore, our in situ TEM investigations clearly 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 the satellite spots of the CO modulations.
PACS: 71.27.+a – Strongly correlated electron systems; heavy fermions / 71.30.+h – Metal-insulator transitions and other electronic transitions / 61.05.J- – Electron diffraction and scattering
© EPLA, 2008
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