Colossal electroresistance effect around room temperature in LuFe2O4

Details Colossal electroresistance effect around room temperature in LuFe2O4 Colossal electroresistance effect around room temperature in LuFe2O4

2008-05-27

arxiv.org/abs/0805.4042v1

Appl. Phys. Lett. 93, 152103 (2008).

Physics

Condensed Matter

Materials Science

11 pages, 5 figures

Scientific paper

A colossal electroresistance effect is observed around room temperature in a transition metal oxide LuFe2O4. The measurements of resistance under various applied voltages as well as the highly nonlinear current-voltage characteristics reveal that a small electric field is able to drive the material from the insulating state to a metallic state. The threshold field at which the insulating-metallic transition occurs, decreases exponentially with increasing temperature. We interpret this transition as a consequence of the breakdown of the charge-ordered state triggered by applied electric field, which is supported by the dramatic dielectric response in a small electric field. This colossal electroresistance effect as well as the high dielectric tunability around room temperature in low applied fields makes LuFe2O4 a very promising material for many applications.

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