Topological defects: These are imperfections in the structure of a material that arise when its internal arrangement (lattice or order parameter) cannot be perfectly aligned.
Resistive switching is a sudden transition between insulating and metallic states triggered by an electric field.
When V2O3 temperature is changed from high to low, the structure changes from rhombohedral shape to less symmetric shape (monoclinic phase) as the material becomes metallic to an insulator.
Researchers used PhotoEmission Electron Microscopy (PEEM) combined with X-rays. The V2O3 film is placed between two gold electrodes that apply the electric field. By measuring the current and voltage, they observe that initially, the material resists the current, but once the voltage reaches a certain threshold, the resistance suddenly drops—indicating the formation of conducting pathways.
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