The latest result of the experiment： LK-99 crystal has no diamagnetism.

　　Recently, South Korea claimed that the phenomenon of "room temperature superconductivity" was realized by using LK-99 crystal, a lead apatite material doped with copper. There is a lot of controversy in the global academic circles, and several teams are reproducing it to falsify it. The research team of Shanghai University also carried out the magnetic susceptibility measurement experiment on the prepared LK-99 crystal.

　　On the evening of August 2nd, Zhang Xin, a reporter from Knews, went to the analysis and testing center of Shanghai University. The reproduction of LK-99 by Shanghai High Temperature Superconductor Key Laboratory was going on, and the experimental results were released recently. Zhu Ping, a doctoral student at Shanghai University, said that the preliminary results show that the measurement of magnetic moment is extremely small with the change of temperature. If superconductivity appears in the relevant temperature range, it has an obvious transformation. Judging from the curve of the preliminary experimental results, there is no diamagnetism in this temperature range at present. The Y-axis of the experimental data represents the magnetization. If it is diamagnetic, at least the magnetic moment should be negative in value. As can be seen from the experimental results, its initial value is 0, and all values are in the range above 0. So this diamagnetism is not shown by this set of data.

　　In addition, look at the news Knews reporter noticed that LK-99 related materials were ground into powder when used in experiments. In this regard, Zhu Ping explained that after grinding, the material is mixed evenly as a whole, which can better show the characteristics of all its materials.

　　(Editor: Liu Qingyang)