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

doi:10.1016/j.physb.2009.11.073

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 journal › Article › peer-review

1 Scopus citations

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(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 language	English
Pages (from-to)	S217-S220
Journal	Physica B: Condensed Matter
Volume	405
Issue number	11 SUPPL.
DOIs	https://doi.org/10.1016/j.physb.2009.11.073
State	Published - 1 Jun 2010
Externally published	Yes

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

Access to Document

10.1016/j.physb.2009.11.073

Cite this

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

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.",

keywords = "Charge order, Nonequilibrium steady state, Nonlinear conduction, Organic conductor",

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

year = "2010",

month = jun,

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doi = "10.1016/j.physb.2009.11.073",

language = "English",

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T1 - Nonequilibrium charge ordering in θ-(BEDT-TTF)2MM'(SCN) 4 (M = Rb, Cs; M' = Co, Zn)

AU - Terasaki, Ichiro

AU - Tasaki, Shuichi

AU - Ajisaka, Shigeru

AU - Nogami, Yoshio

AU - Hanasaki, Noriaki

AU - Watanabe, Masashi

AU - Mori, Hatsumi

AU - Mori, Takehiko

PY - 2010/6/1

Y1 - 2010/6/1

N2 - 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.

AB - 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.

KW - Charge order

KW - Nonequilibrium steady state

KW - Nonlinear conduction

KW - Organic conductor

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