Influence of disorder on the metal insulator phase transition in Di-(Tetramethyltetraselenafulvalene)-ium perbromate, (TMTSF)2BrO4

Abstract
An experimental study including measurements of electrical conductivity, EPR susceptibility and X-ray diffuse scattering of a novel (TMTSF)2 BrO4 salt is presented. Disorder due to static defects inhibits a complete anion ordering phase transition and determines the activated behaviour of the electrical conductivity and the low temperature T-α(α≠ 1) behaviour of the paramagnetic susceptibility