Nonequilibrium charge ordering in θ-(BEDT-TTF)2MM'(SCN) 4 (M = Rb, Cs; M' = Co, Zn)

Ichiro Terasaki, Shuichi Tasaki, Shigeru Ajisaka, Yoshio Nogami, Noriaki Hanasaki, Masashi Watanabe, Hatsumi Mori, Takehiko Mori

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Abstract

Giant nonlinear conduction in the charge ordered organic conductor θ-(BEDT-TTF)2MM'(SCN)4 (M = Cs, Rb; M' = Co, Zn) is analyzed in relation to the current-induced suppression of the charge ordered state characterized by a wave vector of q2 =(0k 1/2). On the basis of a theory of the nonequilibrium Peierls transition, the energy gap is calculated as a function of current density Jext, which is found to depend weakly on temperature in an intermediate temperature range. This justifies the evaluation of the charge-order energy gap Δ from the nonlinear resistivity ρ assuming ρ ∞ exp[Δ(Jext)/kBT], and Δ(Jext) is found to be consistent with the calculation. We compare the present results with nonequilibrium superconducting states induced by excess quasiparticles, and discuss a mechanism of current-induced suppression of the charge ordering in the title compound.

Original languageEnglish
Pages (from-to)S217-S220
JournalPhysica B: Condensed Matter
Volume405
Issue number11 SUPPL.
DOIs
Publication statusPublished - Jun 1 2010

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Keywords

  • Charge order
  • Nonequilibrium steady state
  • Nonlinear conduction
  • Organic conductor

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

Cite this

Terasaki, I., Tasaki, S., Ajisaka, S., Nogami, Y., Hanasaki, N., Watanabe, M., Mori, H., & Mori, T. (2010). Nonequilibrium charge ordering in θ-(BEDT-TTF)2MM'(SCN) 4 (M = Rb, Cs; M' = Co, Zn). Physica B: Condensed Matter, 405(11 SUPPL.), S217-S220. https://doi.org/10.1016/j.physb.2009.11.073