Superconductors have attracted great attention due to their enormous potential for applications, and the search for new high-temperature superconductors is a goal that the scientific community is striving for. On the 18th, it was learned from Fudan University that Professor Zhao Jun's team from the Physics Department of the university successfully grew three layers of nickel oxide using high-pressure optical floating zone technology, confirming the pressure induced bulk superconductivity in nickel oxide, with a superconducting volume fraction of 86%. This means that another new type of high-temperature superconductor has been discovered. The research results were published in the latest issue of Nature on the evening of July 17th Beijing time. The breakthroughs in high-temperature superconductivity research are mostly driven by experiments, especially the discovery of new superconductors, and so far there are still many phenomena that existing theories cannot fully explain Zhao Jun introduced that "the growth conditions of nickel oxide single crystal samples are very strict, requiring high temperature and sharp temperature gradients in a specific high oxygen pressure environment to achieve stable growth of single crystal samples. Due to the small oxygen pressure window for phase formation, it is easy to have layered coexistence of multiple components of nickel oxide, and a large number of defects in vertex oxygen positions are prone to occur during the growth process, which may be the reason for the low superconducting content of nickel oxide." The team used high-pressure optical floating zone technology to grow a large number of samples and finally successfully synthesized pure phase three-layer nickel oxide single crystal samples. The team also conducted a series of neutron diffraction and X-ray diffraction measurements, accurately determining the lattice structure and oxygen atom coordinates and content of the material, and found that there were almost no vertex oxygen defects. In addition, the study also found that this type of material exhibits peculiar metallic and unique interlayer coupling behavior, providing a new perspective and platform for people to understand the mechanism of high-temperature superconductivity. (New Society)