Cooperative dynamics in charge-ordered state of alpha-(BEDT-TTF)2I3

Abstract

Electric-field-dependent pulse measurements are reported in the charge-ordered state of alpha-(BEDT-TTF)2I3. At low electric fields up to about 50 V/cm only negligible deviations from Ohmic behavior can be identified with no threshold field. At larger electric fields and up to about 100 V/cm a reproducible negative differential resistance is observed with a significant change in shape of the measured resistivity in time. These changes critically depend whether constant voltage or constant current is applied to the single crystal. At high enough electric fields the resistance displays a dramatic drop down to metallic values and relaxes subsequently in a single-exponential manner to its low-field steady-state value. We argue that such an electric-field induced negative differential resistance and switching to transient states are fingerprints of cooperative domain-wall dynamics inherent to two-dimensional bond-charge density wave with ferroelectric-like nature.

6 pages, 4 figures, resubmitted to Phys. Rev. B

References in corpus (5)

• Charge Ordering in alpha-(BEDT-TTF)2I3 by synchrotron x-ray diffraction
• Theoretical Aspects of Charge Ordering in Molecular Conductors
• Electrodynamic Response of the Charge Ordering Phase: Dielectric and Optical Studies of alpha-(BEDT-TTF)2I3
• Collective Excitations in the Charge-Ordered Phase of alpha-(BEDT-TTF)2I3
• Collective Charge Excitations below the Metal-to-Insulator Transition in BaVS3

Cited by in corpus (8)

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• Semimetallic and charge-ordered $\alpha$-(BEDT-TTF)${}_2$I${}_3$: on the role of disorder in dc transport and dielectric properties
• Spin excitations in the quasi-two-dimensional charge-ordered insulator $\alpha$-(BEDT-TTF)${}_2$I${}_3$ probed via ${}^{13}$C NMR
• Electrically-induced phase transition in $\alpha$-(BEDT-TTF)${}_2$I${}_3$: Indications for high-mobility hot charge carriers
• Energy Exchange between Phononic and Electronic Subsystem Governing The Nonlinear Conduction in DCNQI${}_2$Cu
• Molecular Dynamics at Electrical- and Optical-Driven Phase Transitions Time-Resolved Infrared Studies Using Fourier-Transform Spectrometers
• Third-order Electrical Conductivity of the Charge-ordered Organic Salt $\alpha$-(BEDT-TTF)${}_2$I${}_3$