Abstract
Abstract
Highlights
Nonlinearity is an important phenomenon in condensed matter physics, among which the nonlinear resistance effect plays an important role in resistor memory[1] and varistors.[2]
Strong nonlinear resistance has been found in the charge ordered ferroelectric iron oxyborate (Fe2OBO3) with a high dielectric constant and giant converse magnetoelectric effect
It is very interesting to see that the current increases significantly as the applied electric field reaches a certain value, which is termed as the threshold electric field (Eth)
Summary
Nonlinearity is an important phenomenon in condensed matter physics, among which the nonlinear resistance effect plays an important role in resistor memory[1] and varistors.[2] Nonlinear resistance has been found in many transition metal oxides with varieties of structures: polycrystals,[3] single crystals,[4] thin films[5] and nanostructures.[6] The origin of nonlinear resistance is different from each other and still a controversial issue. One possible mechanism leading to resistance switching concerned with the modification of charge order (CO) was advanced by Lee and Zeng.[6,9] CO configuration has been studied in the strongly correlated systems that exhibit lots of interesting physical phenomena including colossal magnetoresistance[10] and high-temperature superconductivity.[11] Recently it was found that CO could give rise to ferroelectricity in the so called electronic ferroelectric materials (i.e., Pr1-xCaxMnO3,12 LuFe2O4,13,14 iron oxyborate (Fe2OBO3)[15]).
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