Abstract
We demonstrated high-pressure studies on two kinds of layered organics. One is a Mott insulator, β'-(BEDT-TTF) 2 ICl 2 , with an exactly half-filled band. By applying extremely high pressure to it, we observed the highest- T c superconductivity among organics. T c amounts to 14.2 K at 8.2 GPa. The other is a doped-type conductor, κ-(BEDT-TTF) 4 Hg 2.78 Cl 8 , with the band-filling shifted from the half-filled state. We uncovered that it had an anomalous pressure-temperature phase diagram. T c had a minimum structure within the superconducting phase along with pressure axis. In addition, we found that this superconducting phase was lying in between two nonmetallic phases.
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