We demonstrate that an organic Mott insulator, 0 -(BEDT-TTF) 2 ICl 2 , is metallized by application of extremely high pressure by means of the cubic anvil press. When the metallic state is stabilized, superconductivity with the highest transition-temperature (T c ) among the organic systems appears. The lower limit of the pressure at which the superconducting transition manifests itself is approximately 7.0 GPa and T c reaches a maximum value, 14.2 K (onset), at 8.2 GPa. The pressure-temperature phase diagram is constructed and discussed in terms of the comparison with those of other organic systems.
Physical properties of an organic conductor,-(BEDT-TTF) 2 IBrCl, were characterized under ambient and extremely high pressures. Semiconducting behavior with activation energy, E a =0.11eV, and antiferromagnetic transition with T N =19.5K were uncovered in the present work. In addition, we have found that this salt showed a sign of superconductivity at 8.0GPa in common with the case of the-(BEDT-TTF) 2 ICl 2 , which is the highest-T c superconductor among organics.
The resistive state of the charge-transfer complex, (BEDT-TTF)(TCNQ), was studied by application of hydrostatic pressure and uniaxial strain. An obtained (hydrostatic) pressuretemperature phase diagram was different from a reported one [1]: in our phase diagram, lowtemperature metallic phase exists. The results obtained by application of uniaxial strains were discussed in terms of a role of the dimer of BEDT-TTF in the present salt.
An organic Mott insulator,-(BEDT-TTF) 2 ICl 2 , is metallized by application of extremely high pressure up to 9.0GPa. When the metallic state is stabilized, superconductivity with the highest transition-temperature (T c) among organic systems appears. The maximum T c that we observed was 14.2K(onset) at 8.2GPa. A magnetic-field effect on this superconductivity and normal-state properties are discussed in terms of comparison with other organic superconductors.
We demonstrated high-pressure studies on two kinds of layered organics. One is a Mott insulator, β -(BEDT-TTF)2ICl2, with an exactly half-filled band. By applying extremely high pressure to it, we observed the highest-Tc superconductivity among organics. Tc amounts to 14.2 K at 8.2 GPa. The other is a doped-type conductor, κ-(BEDT-TTF)4Hg2.78Cl8, with the band-filling shifted from the half-filled state. We uncovered that it had an anomalous pressuretemperature phase diagram. Tc 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.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.