Electrical Properties of New Organic Conductor (BEST)₂InBr₄ [BEST = Bis(ethylenediseleno)tetrathiafulvalene] up to 10.8 GPa and Antiferromagnetic Transition of (BEST)₂FeBr₄

A new organic conductor, (BEST)₂InBr₄, with alternating donor layer arrangement has been synthesized, and the electrical properties have been investigated up to 10.8 GPa. The temperature dependence of the high-pressure resistivity shows a complicated metal−semiconductor transition behavior. The room temperature resistivity decreases with pressure up to 8.6 GPa but increases at higher pressures. The magnetic susceptibility of an isostructural (BEST)₂FeBr₄ salt shows an antiferromagnetic transition at 4.4 K, which is suppressed with increasing magnetic field.