The reporter learned from the Hefei Institute of Materials Science and Technology of the Chinese Academy of Sciences on the 21st that the Institute of Solid State Physics Research Institute for Extreme Environment Quantum Center, in collaboration with experts from the Italian National Institute of Optics, successfully synthesized a new hydride of selenium. The hydride is a potential The high-temperature superconductors have important significance for the study of superconductivity. This research result was published online in the famous international journal Physical Review B.
In recent years, an important event in the field of condensed matter physics was the discovery at 203K that the sulfur-hydrogen system had superconductivity. Selenium was used as the main element of sulfur, and the study of the selenium-hydrogen system has also attracted widespread attention. Previously, research units passed the One-principle and density functional theory predict that there are several high-temperature superconductors in the selenium-hydrogen system. However, these materials do not exist in nature. Therefore, synthesis of these selenium hydrogen materials is to study the superconductivity of selenium-hydrogen systems. Prerequisites.
The research team of the Institute of Solid State Physics used diamond high-pressure anvil technology to change the intermolecular interactions by applying pressure, and combined with laser heating technology to induce chemical reaction of selenium and hydrogen in the pressure cavity, successfully synthesize new hydrides of selenium. It was found that when the pressure exceeds 5 GPa, the Raman spectrum of selenium-hydrogen in the high pressure chamber exhibits new selenium-hydrogen and hydrogen-hydrogen vibration modes, and its vibration mode changes with pressure. High-voltage synchrotron radiation X-ray diffraction analysis shows that This new hydride is a new hydride of selenium with a special space group in the theoretical predictions. The hydride can be stable to at least 40 GPa at low temperatures, and a suspected metallization occurs at 23 GPa. Moreover, this new type of selenium The behavior of hydrides under high pressure is similar to that of super-conducting sulfur-hydrogen systems, but the pressure of synthesis is much lower than that of the latter. Combining the theory predicts that selenium-hydrogen systems are likely to achieve superconducting transitions at lower pressures. The synthesis of new hydrides is of great significance for studying the superconductivity of hydrogen selenide systems.
