Shulou(Shulou.com)11/24 Report--

CTOnews.com, August 3, according to the interface news, a research team led by Liu Xiaobing, a professor at the School of Physics and Engineering of Qufu normal University, recently conducted a reproduction experiment on the diamagnetic material LK-99, which South Korea claimed to have discovered room temperature superconductors, and released the preliminary resistance test results on the evening of August 2. The test results show that the material still has a large resistance in the range from room temperature to 50K (- 223.16 ℃), and there is no sharp drop in resistance or zero resistance in the testing process, which is far from the zero resistance characteristic expected by "room temperature superconductor".

According to the report, Professor Liu Xiaobing said that this is the first resistance test for LK-99 except for the Korean research team. He said that it is not clear the underlying reasons for this result, and further research is needed to confirm it.

Professor Liu Xiaobing said that they had observed a similar diamagnetic phenomenon in some of the LK-99 polycrystalline particles prepared in the laboratory. However, only diamagnetism does not mean superconductivity, but also requires zero resistance at the same time. At present, all the results can only show that the material has diamagnetism, which is far from being proved to be the Meissner effect. Meissner effect is the repulsive phenomenon of magnetic field in the process of superconductor phase transition from general state to superconducting state, which is regarded as an important feature of the realization of superconductivity.

Professor Liu Xiaobing pointed out that although they did not observe the same resistance data as the Korean researchers, they could not directly rule out the room temperature superconducting properties of LK-99 materials reported by the Korean research group, which may be due to differences in sample purity or superconducting component content. He believes that there are still many areas that need to be adjusted in the process of LK-99 sample preparation, and at present, it is difficult to repeat the experiment successfully, such as the improvement of sample purity, impurity content, crystal quality and so on.

Professor Liu Xiaobing also said that netizens mentioned that LK-99 is the best material for human maglev technology, which needs to be treated rationally and objectively, and any new material has a long way to go from discovery to final large-scale application. What's more, the current understanding of LK-99 is still very limited. He said that the realization of room temperature superconductivity is the dream of all mankind, and if it can be successfully realized, it will completely change human life, but exploring the road of room temperature superconductivity is destined to be difficult, and it will face more unknown and challenges.

It is understood that Professor Liu Xiaobing is the head of the high pressure physics and materials science research team of Qufu normal University, which was established in August 2017. The research work mainly focuses on the fields of high pressure science, superhard and superconducting materials. From 2012 to 2017, Liu Xiaobing worked as a postdoctoral researcher at Northwestern University and then returned to teach in China. In the past five years, the team has published more than 100 high-level academic papers such as PNAS, and presided over more than 20 scientific research projects at the national and provincial and ministerial levels.

Previously, the relevant research team of Korea Quantum Energy Research Center announced through two papers and videos that a modified lead apatite (LK-99, named after the initials of Lee and Kim) could behave as a superconductor below 400K (127K) under atmospheric pressure. After that, a number of teams at home and abroad began to reproduce the experimental results of the Korean research team. At present, three teams from Beijing University of Aeronautics and Astronautics, Qufu normal University and Huazhong University of Science and Technology have completed the reproduction experiment. Among them, the team of Huazhong University of Science and Technology reproduced its diamagnetism, but did not verify whether it was zero resistance. The experimental results of Beijing University of Aeronautics and Astronautics also show that no superconductivity is detected on LK-99.

CTOnews.com reported earlier that the Korea Superconductor Society has announced the establishment of a "LK-99 Certification Committee" to test the authenticity of the results. So far, the Society has concluded that LK-99 cannot be called a room temperature superconductor based on the data provided in the two papers and the released videos.

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