Abstract
In an organic conductor β″-[bis(ethylenedithio)tetrathiafulvalene]3(HSO4)2, characteristic voltage oscillation is observed in the negative differential resistance region of the nonlinear conductivity below the metal–insulator transition at 125 K. The observed frequency f is 4–25 kHz and increases linearly with the collective current Jco. The oscillation appears in the two crystal directions of the conducting layer in agreement with the two-dimensional nonstripe charge order, where the anisotropy of the Jco/f slope is about two. The voltage oscillation disappears when the contact distance is larger than 0.02 cm, and at the same time the current-voltage characteristics loses a sharp negative resistance region. Since this critical length corresponds to the characteristic domain size of the charge order, the observed oscillation is interpreted by coherent transport of charge order which can move in different two directions.
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