New progress in research on two-dimensional high temperature superconductors

[ Instrument Network Instrument Development ] Chen Xianhui, a professor at the University of Science and Technology of China, and Zhang Yuanbo, the physics department of Fudan University, have made new progress in revealing the mechanism of high temperature superconductivity. The research results were published online in the international academic journal Nature in October 31, Beijing time.

Two-dimensional material é“‹2212 structure

Superconductivity is one of the most fascinating macroscopic quantum phenomena in physics, and it is a long-term research field. However, the mechanism of unconventional high temperature superconductivity is still not completely solved. How to find the key to the door of high-temperature superconducting secrets is a problem that scientists are eager to ask. The usual research method of physicists is to try to reveal the laws of the world with the most succinct models.

The copper oxide high-temperature superconductor has a variety of three-dimensional layered crystal structures, and all the copper-based superconductors discovered so far have the same copper-oxygen structural unit. These copper-oxygen structural units are considered to be the origin of high-temperature superconductivity, especially when theoretical physicists study the high-temperature superconducting mechanism, based on the copper-oxygen surface structural unit to establish a two-dimensional theoretical model. Therefore, it is very important and experimental to verify whether a two-dimensional superconductor containing a single layer of a copper oxide structural unit has the same superconductivity and normal state physics as the corresponding bulk crystal. After years of exploration and experiment, Chen Xianhui and Zhang Yuanbo and his research team successfully obtained a single layer of é“‹2212 superconductor, and experimentally found that the single layer copper-based superconductor and the corresponding bulk copper-based superconductor have exactly the same superconducting transition temperature. , carrier concentration dependent phase diagram and abnormal normal behavior. These findings provide a solid experimental basis for the two-dimensional theoretical model of high-temperature superconductors, and also provide new ideas for the experimental study of high-temperature superconductors.