Pressure in study of organic conductors and superconductors

Summary form only given. Review of the influence of high pressure on the properties of organic conductors is proposed. The main methods of generation of hydrostatic pressure for study of the organic conductors and superconductors up to 80 kbar are shortly observed. The properties of some organic conductors which undergo the first-order phase transition under pressure and can be used as the pressure markers are discussed. The conductivity dependence on pressure up to 80 kbar at room temperature for ET-based organic conductors (ET bis(ethylenedithio) tetrathyafulvalene) are discussed. It is shown for organic superconductor /spl beta/-ET/sub 2/I/sub 3/ that the /spl beta//sub L/- or /spl beta//sub H/-states appear in dependence of the linear or nonlinear behavior of /spl sigma/(p). Anomalous conductivity dependence on pressure of the salt PT/sub 2/I/sub 3/ (bis(propylenedithio)tetrathiafulvalene) is discussed. It is shown for this salt that its conductivity increases nearly linear about 1500 times with pressure at 80 kbar and room temperature. T/sub c/ dependence on pressure for /spl beta/- and /spl kappa/-phases ET-based salts is observed for which as rule dT/sub c//dp<0. Specific attention was paid to the salt ET/sub 4/Hg/sub 2.89/Br/sub 8/ for which dT/sub c//dp>0. T-p phase diagram is shown and influence of the deuteration on the structure and superconducting properties is discussed for this salt.