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The current-voltage characteristics of layered organic crystals θ-(BEDT-TTF)₂MZn(SCN)₄ (M=Cs,Rb) follow the power law with a large exponent (e.g., 8.4 at 0.29 K for M=Cs) over a wide range of currents in the low-temperature insulating state. The power-law characteristics are attributed to electric field-induced unbinding of electron-hole pairs that are thermally excited in the background of the two-dimensional charge order. The magnitude of crossover electric fields from Ohmic to the power-law characteristics indicates that the electron-electron Coulomb interaction is significantly long-ranged: The screening length is greater than 10 molecule sites.
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Yamaguchi et al. (2006) studied this question.
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