Emergent reversible giant electroresistance in spacially confined La_0.325Pr_0.3Ca_0.375MnO₃ wires

Micro-patterning is considered to be a promising way to analyze phase-separated manganites. We investigate resistance in micro-patterned La_0.325Pr_0.3Ca_0.375MnO₃ wires with width of 10 μm, which is comparable to the phase separation scale in this material. A reentrant of insulating state at the metal-insulator temperature T_p is observed and a giant resistance change of over 90% driven by electric field is achieved by suppression of this insulating state. This resistance change is mostly reversible. The I-V characteristics are measured in order to analyze the origin of the giant electroresistance and two possible explanations are proposed.