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The title compound undergoes a metal-insulator phase transition of unknown origin at TMI = 135 K. We studied the electrodynamic response of Q-(BEDT-TTFhh in a wide range of frequency, covering microwave and millimeter wave frequencies as weIl as the optical spectral range, and found a frequency dependent conductivity up to 1000 cm- 1 in the low temperature phase. This is accompanied be a non-linear transport with a smooth onset at about 10 V fcm. Our X-ray studies show no indication of superstructure reflections and clearly rule out the formation of a charge density wave ground state. The lack of a temperature dependence in the millimeter wave conductivity between 20 K and 100 K makes hopping transport unlikely.

Field- and frequency dependent transport in the two-dimensional organic conductor -(BEDT-TTF)2I3