Further Aspects of the Electrical Conduction in the Highly Anisotropic Organic Semiconductor TEA (TCNQ)2

A complete report of experimental results on the dc electrical conductivity of TEA (TCNQ)2 is presented. In order to reconcile these results with the known structural and magnetic properties, it is suggested that the electron interactions play a fundamental role in the low lying magnetic excitations but have only a small influence on the much more energetic excitations to the conducting states. Conduction thus appears to resemble that of a band gap semiconductor modified by band tailing as a result of the cation disorder.