According to reports from the Institute of Physics, Chinese Academy of Sciences, a research team from China has made significant progress in collaboration with multiple international research groups in the study of nickel-based high-temperature superconductors. Researchers utilized the National "12th Five-Year Plan" major scientific and technological infrastructure, the Comprehensive Extreme Conditions Experimental Facility (SECUF), to simultaneously provide two key experimental evidences for achieving bulk high-temperature superconductivity under high pressure in polycrystalline samples of praseodymium-doped double nickel oxide perovskite (La2PrNi2O7), namely zero resistance and complete diamagnetism. This work clarifies the contentious issues regarding the origins of high-temperature superconductivity and bulk superconductivity in double nickel oxide perovskite materials (La3Ni2O7) and reveals the detrimental effects of microscopic structural disorder on high-temperature superconductivity. This research is of significant guidance for the further optimized design and synthesis of nickel-based high-temperature superconductors, and will advance the research progress in this field. The relevant research findings were published in the international academic journal *Nature* on October 2, Beijing time.
Photos of the six-sided anvil high-pressure experimental station and the strong magnetic field nuclear magnetic resonance experimental station of the Comprehensive Extreme Conditions Experimental Facility, as well as the high-pressure structural evolution and superconducting phase diagram of La2PrNi2O7 polycrystalline samples.
The Comprehensive Extreme Conditions Experimental Facility (SECUF) is located at the Beijing Huairou Comprehensive National Science Center. Established by the Institute of Physics, Chinese Academy of Sciences, among others, it is a major national scientific and technological infrastructure project of the Twelfth Five-Year Plan, and it is the first national major scientific and technological infrastructure to commence work in Huairou Science City. It entered full trial operation at the beginning of 2023. Currently, SECUF has built an internationally advanced user experimental facility that integrates extremely low temperatures, ultra-high pressures, strong magnetic fields, and ultrafast optical fields, greatly enhancing China's comprehensive strength in fundamental research and applied basic research in material science and related fields.
