Current-Voltage Characteristics of Charge-Ordered Organic Crystals

Yamaguchi Takahide, Takako Konoike, Kengo Enomoto, Mitsuka Nishimura, Taichi Terashima, Shinya Uji, and Hiroshi M. Yamamoto
Phys. Rev. Lett. 96, 136602 – Published 7 April 2006

Abstract

The current-voltage characteristics of layered organic crystals θ(BEDTTTF)2MZn(SCN)4 (M=Cs,Rb) follow the power law with a large exponent (e.g., 8.4 at 0.29 K for M=Cs) over a wide range of currents in the low-temperature insulating state. The power-law characteristics are attributed to electric field-induced unbinding of electron-hole pairs that are thermally excited in the background of the two-dimensional charge order. The magnitude of crossover electric fields from Ohmic to the power-law characteristics indicates that the electron-electron Coulomb interaction is significantly long-ranged: The screening length is greater than 10 molecule sites.

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  • Received 27 October 2005

DOI:https://doi.org/10.1103/PhysRevLett.96.136602

©2006 American Physical Society

Authors & Affiliations

Yamaguchi Takahide1, Takako Konoike1, Kengo Enomoto1, Mitsuka Nishimura1, Taichi Terashima1, Shinya Uji1, and Hiroshi M. Yamamoto2

  • 1National Institute for Materials Science, Tsukuba 305-0003, Japan
  • 2RIKEN (The Institute of Physical and Chemical Research), Wako 351-0198, Japan

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Issue

Vol. 96, Iss. 13 — 7 April 2006

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