کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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1811829 | 1025602 | 2010 | 4 صفحه PDF | دانلود رایگان |
Giant nonlinear conduction in the charge ordered organic conductor θ‐(BEDT‐TTF)2MM′(SCN)4θ‐(BEDT‐TTF)2MM′(SCN)4 (M=CsM=Cs, Rb; M′=CoM′=Co, Zn) is analyzed in relation to the current-induced suppression of the charge ordered state characterized by a wave vector of q2=(0k12). On the basis of a theory of the nonequilibrium Peierls transition, the energy gap is calculated as a function of current density JextJext, which is found to depend weakly on temperature in an intermediate temperature range. This justifies the evaluation of the charge-order energy gap ΔΔ from the nonlinear resistivity ρρ assuming ρ∝exp[Δ(Jext)/kBT]ρ∝exp[Δ(Jext)/kBT], and Δ(Jext)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.
Journal: Physica B: Condensed Matter - Volume 405, Issue 11, Supplement, 1 June 2010, Pages S217–S220