Abstract
Abstract We present the results of conductivity and thermopower measurements on several new conducting organic compounds. (BEDT-TTF)2BrO4 is isomorphous with the superconducting ReO4 salt; our data show it to be metallic above 200K and semiconducting below 100K, although without any clear transition. In (TMTSF)2SiF5 the anion is neither octahedral nor tetrahedral; however, our results suggest behavior very like the octahedral salts. (BEDT-TTF)2InBr4 is semiconducting at room temperature with an activation energy of .12 ev. Low-temperature conductivity measurements on (BEDT-TTF)2I3 at 0.5 kbar show suppression of the known ambient-pressure superconducting state to below 1K, and an anomaly at 7K reminiscent of the CDW transition in NbSe3.
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