Temperature Dependence of Conductivity of Tetrathiafulvalene-Tetracyanoquinodimethane (TTF-TCNQ) Single Crystals

The conductivity of single crystals of tetrathiafulvalene-tetracyanoquinodimethane (TTF-TCNQ) was measured over the temperature range 40-300 K. The maximum low-temperature conductivity parallel to the $b$ axis ranged from 12-35 times the corresponding room-temperature value. The temperature dependence of the intrinsic conductivity (after residual resistivities were excluded) was the same for all crystals measured and was fitted by a $T^{-2.33\mathrm{}\pm 0.14}$ dependence for $60<~T<~300$ K.