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

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• 作者：Ichiro Terasaki ; Shuichi Tasaki ; Shigeru Ajisaka ; Yoshio Nogami ; Noriaki Hanasaki ; Masashi Watanabe ; Hatsumi Mori ; Takehiko Mori
• 关键词：Organic conductor ; Charge order ; Nonlinear conduction ; Nonequilibrium steady state
• 刊名：Physica B
• 出版年：2010
• 出版时间：1 June 2010
• 年：2010
• 卷：405
• 期：11, Supplement 1
• 页码：S217-S220
• 全文大小：297 K

文摘

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 . On the basis of a theory of the nonequilibrium Peierls transition, the energy gap is calculated as a function of current density J_ext, 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.