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- W2016669439 abstract "Abstract The b-axis conductivity of the one-dimensional two-chain organic conductor TTF-TCNQ was measured as a function of electric field E for temperatures T ≲ 30 K and pressures P ≳ 24 kbars. At P = 1 bar, TTF-TCNQ undergoes three successive phase transitions : the high temperature T H (incommensurate Peierls) transition involving the electron-like TCNQ l stacks, the lower two transitions (T M ,T L ) involving the hole-like TTF stacks. We have found at P = 1 bar deviations from Ohm's law, with a threshold field E T , in the neighbourhood and below T H . E T reaches a minimum just below T H before rapidly increasing below T M . At 4 and 9 kbars T M = T L , and hence, the range of T where there is a single incommensurate CDW is large. In this P range, nonlinear effects are observed and the T dependence of E T is less weak below its minimum value than at 1 bar. As the CDW is driven through third-order commensurability at ∼ 19 kbars, we find at constant T/T H a peak in E T and a minimum in the excess current at 30 V/cm. These results are discussed in terms of the depinning of the CDW by the electric field, taking into account the interactions between the two types of chains and the possibility of discommensuration transport near commensurability." @default.
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- W2016669439 date "1986-11-01" @default.
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- W2016669439 title "The evolution of nonlinear electrical transport effects in TTF-TCNQ as driven through CDW commensurability" @default.
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