Dielectrophoresis model for the colossal electroresistance of phase-separated manganites

Abstract

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.

4 pages, 5 figures

References in corpus (3)

• Evidences of a consolute critical point in the Phase Separation regime of La(5/8-y)Pr(y)Ca(3/8)MnO(3) (y = 0.4) single crystals
• Electric Field Induced Collapse of Charge-Ordered Phase in Manganites
• Dielectric catastrophe at the magnetic field induced insulator to metal transition in Pr1-xCaxMnO3 (x=0.30, 0.37) crystals

Cited by in corpus (6)

• Ferromagnetic tendency at the surface of CE charge-ordered manganites
• Recent Progress of Multiferroic Perovskite Manganites
• Highly anisotropic resistivities in the double-exchange model for strained manganites
• Dynamics of a first order electronic phase transition in manganites
• Colossal electroresistance and colossal magnetoresistive step in paramagnetic insulating phase of single crystalline bilayered manganite(La${}_{0.4}$Pr${}_{0.6}$)${}_{1.2}$Sr${}_{1.8}$Mn${}_2$O${}_7$
• Inhomogeneous Phases in a Double-Exchange Magnet with Long Range Coulomb Interactions