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

Research output: Contribution to journalArticle

1 Citation (Scopus)

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 q 2 =(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(J ext)/k BT], and Δ(J ext) 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
JournalPhysica B: Condensed Matter
Volume405
Issue number11 SUPPL.
DOIs
Publication statusPublished - Jun 1 2010

Fingerprint

Induced currents
Energy gap
retarding
Organic conductors
Electron transitions
Current density
conductors
current density
conduction
Temperature
electrical resistivity
temperature
evaluation
BEDT-TTF

Keywords

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

ASJC Scopus subject areas

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

Cite this

Nonequilibrium charge ordering in θ-(BEDT-TTF) 2MM'(SCN) 4 (M = Rb, Cs; M' = Co, Zn). / Terasaki, Ichiro; Tasaki, Shuichi; Ajisaka, Shigeru; Nogami, Yoshio; Hanasaki, Noriaki; Watanabe, Masashi; Mori, Hatsumi; Mori, Takehiko.

In: Physica B: Condensed Matter, Vol. 405, No. 11 SUPPL., 01.06.2010.

Research output: Contribution to journalArticle

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, vol. 405, no. 11 SUPPL.. https://doi.org/10.1016/j.physb.2009.11.073
Terasaki, Ichiro ; Tasaki, Shuichi ; Ajisaka, Shigeru ; Nogami, Yoshio ; Hanasaki, Noriaki ; Watanabe, Masashi ; Mori, Hatsumi ; Mori, Takehiko. / Nonequilibrium charge ordering in θ-(BEDT-TTF) 2MM'(SCN) 4 (M = Rb, Cs; M' = Co, Zn). In: Physica B: Condensed Matter. 2010 ; Vol. 405, No. 11 SUPPL.
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AU - Nogami, Yoshio

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