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

CTOnews.com, July 31 (Xinhua) Last week, a team of South Korean scientists announced that they had discovered the world's first room temperature superconductor, the "modified lead apatite crystal structure (LK-99)", which caused a sensation in the global physics community and aroused questions from a large number of people in the industry.

In the early morning of July 31, Beijing time, the team published in the preprint arXiv, "superconductor Pb10 − xCux (PO4) 60o shows suspension phenomenon and its mechanism at room temperature and atmospheric pressure." Hyun-Tak Kim, a research professor at the Physics Department of the College of William and Mary in the United States, said in a reply to the Daily Business News that the LK-99 room temperature superconductor made by his team may be replicated within a month. Its members will also provide guidance to anyone who has difficulties in making LK-99. " If researchers have questions about our results, they will question our results. Therefore, I chose to disclose the production technology of LK-99. "

According to the video content, the suspension of the LK-99 sample is not perfect, and one side still seems to be in contact with the magnet. As to why the samples are "imperfect", Hyun-Tak Kim said, "We have shown videos of some samples showing the Meissner effect, which is the evidence that we have found the room temperature superconductivity of LK-99. But from now on, we must create a sample that can trigger the Meissner effect at 100%."

In addition, some industry insiders found significant inconsistencies in the team's two papers published on arXiv. In response, Hyun-Tak Kim said, "this is a good question. In fact, we found a mistake in the second paper: when merging the two data together, one of the multipliers was accidentally omitted. So one of the data in this paper is wrong. Now we have uploaded the revised version to arVix, and the revised paper will be available to you on Tuesday."

No team has successfully replicated the Korean team's experiment, but CTOnews.com notes that several experts have questioned the team's paper. Hong Zhiyong, an expert in applied superconducting research and director of the Shanghai Superconducting Materials and Systems Engineering Research Center, said that the maximum probability of superconductors recently announced by the South Korean research team is not room temperature superconductivity, according to the Financial Associated Press. Hong Zhiyong said that according to the current situation, the testing methods and methods reported by his team are not very orthodox superconducting material verification experiments. Previously, the experimental conditions announced by Diaz's team were limited to 10,000 atmospheric pressure, because the presentation of the data was too "perfect" and the authenticity of the data was questioned. But this time the South Korean team is the other way around. they report that the synthesis method of the material is very clear and simple, but the test method and the presentation form of the data as well as the rigor of the data are very rough. What's more, it is far from some internationally recognized testing methods to verify superconducting properties. From the present data, they are only synthesized and mixed, and among the lead apatite compounds which should not have obvious electromagnetic properties, they are found to have certain electrical conductivity and weak diamagnetism at room temperature. however, this conductivity is also weaker than copper, silver and other metal conductors, which is an interesting physical phenomenon, but the experimental results are still far from proving that the sample is a superconductor or contains superconducting components.

According to thepaper.cn, Wen Haihu, a professor at the School of Physics at Nanjing University, said in an interview on July 28, "it's really lively, but it's not surprising, because this matter is very important." Most people don't make superconductors. "" We carefully analyzed their data and found that it is not a superconducting phenomenon from three aspects-resistance, magnetization and so-called magnetic levitation. "" Our judgment (what it calls superconductivity) is very likely to be an illusion. "

As for the repeated experiment, Wen Haihu said, "in fact, none of us wanted to do it, because we judged that it was not like superconductivity, and later we sent a classmate to do it." many international groups are repeating. in our experience, (the data released in the paper so far) is not enough to prove that it is superconducting. "

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