SAKATA-Masafumi

SAKATA Masafumi
Title Associate Professor
Department Department of Electrical, Electronic and Computer Engineering
Course Electrical and Electronic Course

Research fields

Our research is related to structural change and physical properties of materials under extremely high pressure. Especially, it is focused on the superconductivity which is characterized by zero electrical resistance and perfect diamagnetism (Meissner effect). For example, several elements, which are no superconductive under ambient pressure, show pressure-induced superconductivity because of structural change under high pressure.

Recently, it was reported that hydrogen sulfide (H2S) changes to superconductive cubic-H3S with high critical temperature (Tc = 200 K) by application of extremely high pressure above 150 GPa (1.5 million atmospheric pressure), so hydrides stabilized under extremely high pressure have been become to be candidates of high-Tc superconductors. Furthermore, lanthanum hydride (LaH10) under extremely high pressure becomes to be superconducting state close to room temperature (Tc = 250~260 K). Predictions from theoretical calculation and experimental demonstrations have been carried out for high-Tc superconductive hydride.

In order to discover of novel hydride superconductor, raise Tc on known hydride, and determine detailed crystal structure of hydride, we have performed measurements of physical properties (mainly electrical resistance), optical measurement such as Raman spectroscopy, and synchrotron X-ray diffraction measurement using diamond anvil cell.

　　　　　　　　　　　　

　　　　　　　　　　　　

Electrical resistance measurement under extremely high pressure

(hydrogen sulfide superconductor)

Research Keywords

High pressure physical properties, Superconductivity, Hydrides, Molecular conductors

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