TY - JOUR
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
N1 - Funding Information:
The authors would like to thank S. Kagoshima and T. Kato for fruitful discussion. This work was supported by the Grant-in-Aid for Scientific Research (nos. 17340114 and 16076213) by MEXT, and by the Long-Term Proposal at BL02B1, SPring-8.
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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U2 - 10.1016/j.physb.2009.11.073
DO - 10.1016/j.physb.2009.11.073
M3 - Article
AN - SCOPUS:84859889903
SN - 0921-4526
VL - 405
SP - S217-S220
JO - Physica B: Condensed Matter
JF - Physica B: Condensed Matter
IS - 11 SUPPL.
ER -