We report an important drop in the longitudinal conductivity of TTF-TCNQ occurring at constant temperature in the metallic phase and in a narrow pressure domain located around 19 kbar. No change of the transverse conductivity has been noticed in the same pressure region. The conductivity drop has been related to the x 3 commensurability of the longitudinal distortion with the lattice. It brings the proof that a significant fraction of the metallic conductivity of incommensurate TTF-TCNQ at low temperature is due to the fluctuating collective mode.
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Andrieux et al. (1979) studied this question.
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