We are investigating the FeSe superconductor which has the simplest crystal structure among iron-based superconductors. It was found that the Tc of FeSe is enhanced up to 37K under high pressure. For practical applications, FeSe superconducting wire is also fabricated. We have discovered a new superconductor of S-doped FeTe as shown in Fig. 1,2. Everyone has a chance to discover new superconductors. The ultimate goal of our research is to find superconductors that operate at room temperature.

Diamond is not only the king of jewel but also a good electrical material. Since diamond changes with boron doping from insulator to superconductor (Fig. 3), it is possible to fabricate new functional devices using only diamond.

(1) Physical property measuring device using the hardest diamond in the world as an electrode
Very interesting physical phenomena such as room temperature superconductivity of hydrogen are predicted under super high pressure. On the other hand, in order to measure physical properties under such an extreme environment, there are various difficulties such as the problem of strength of the electrode. Therefore, we processed boron-doped diamond, the world's hardest electrode, into electrodes by microfabrication technology and developed the world's first diamond electrode introduction type pressure device.

(2) Success of super high pressure loading experiments exceeding 100 GPa
As a result of pressure discovery experiment using pressure device with newly developed diamond electrodes, we succeeded in generating super high pressure above 100 GPa. It is expected to be applied to the observation of various physical phenomena occurring in multi megabar regions.