Dielectrophoresis model for the colossal electroresistance of phase-separated manganites

Details Dielectrophoresis model for the colossal electroresistance of phase-separated manganites Dielectrophoresis model for the colossal electroresistance of phase-separated manganites

2007-05-23

arxiv.org/abs/0705.3296v2

Physical Review B 76, 132409 (2007)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 5 figures

Scientific paper

10.1103/PhysRevB.76.132409

We propose a dielectrophoresis model for phase-separated manganites. Without increase of the fraction of metallic phase, an insulator-metal transition occurs when a uniform electric field applied across the system exceeds a threshold value. Driven by the dielectrophoretic force, the metallic clusters reconfigure themselves into stripes along the direction of electric field, leading to the filamentous percolation. This process, which is time-dependent, irreversible and anisotropic, is a probable origin of the colossal electroresistance in manganites.

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