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Nano Frontier Superconducting Materials Group

Since superconductors can transport energy without loss, it is expected that superconductivity is a key solution technology to energy problems. We are focusing on the physical properties of Fe-based superconductors, diamond superconductors, high-Tc superconductors and carbon nanotubes. We have developed a superconducting wire using newly discovered superconducting materials. Development of novel devices, including optical and field effect devices, using superconductors and nano-technologies are targets.

Specialized Research Field

1. Iron-based superconductor and novel superconductor

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.

"Fig 1. Crystal structure of FeTe new superconductor." Image

Fig 1. Crystal structure of FeTe new superconductor.


"Fig.2. Resistivity properties of Fe(Te,S) superconductor." Image

Fig.2. Resistivity properties of Fe(Te,S) superconductor.




2. Superconducting diamond thin film

"Fig. 3. SEM image of superconducting diamond film." Image

Fig. 3. SEM image of superconducting diamond film.


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.


3. Development of pressure measurement device using diamond electrode

"Fig. 4. Schematic picture of newly developed pressure device with diamond electrodes and result of the pressure loading above 100 GPa." Image

Fig. 4. Schematic picture of newly developed pressure device with diamond electrodes and result of the pressure loading above 100 GPa.


(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.


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Nano Frontier Superconducting Materials Group
1-2-1 Sengen, Tsukuba, Ibaraki, 305-0047 JAPAN
National Institute for Materials Science (NIMS)
1-2-1 Sengen, Tsukuba, Ibaraki 305-0047, JAPAN
TEL.+81-(0)-29-859-2000
FAX.+81-(0)-29-859-2029