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

Thanks to CTOnews.com netizens, money shredder nursery, Xiangya medical students, interstellar fortress, dog eggs a bucket of paste clues delivery! CTOnews.com August 1 news, bilibili up master @ Guanshankou male technician now released Huazhong University of Science and Technology synthesis and verification of "LK-99" video.

From the video, we can see that the diameter of the LK-99 crystal (the "small black spot" under the microscope) synthesized by the research team of Huazhong University of Science and Technology is calculated in microns and has obvious diamagnetic effect (partial suspension), but the superconductivity and flux quantization have yet to be verified.

According to what he said a few days ago, although the first prepared crystal has diamagnetism, it is relatively weak, and there is no so-called "zero resistance". The overall performance is like a semiconductor curve. He believes that even if LK-99 has a superconducting phase, it is still a small amount of superconducting impurities and can not form a continuous superconducting path.

He puts a piece of NdFeB magnet under it, and the "small black spot" can fall or stand up with the neodymium-iron-boron magnet approaching and away, and both S-pole and N-pole produce the above reaction, that is, the repulsion is independent of the magnetic pole, showing diamagnetism.

(CTOnews.com Note: superconductors must have diamagnetism, but diamagnetism does not necessarily mean they are superconductors. The team is currently preparing for follow-up verification.)

It is said that under the guidance of Professor Chang Haixin, Wu Hao and Yang Li, postdoctoral students in the School of Materials of Huazhong University of Science and Technology, successfully verified and synthesized the LK-99 crystal that can be magnetically levitated for the first time. The suspension angle of the crystal is larger than that of the samples obtained by Sukbae Lee and others, and it is expected to achieve a real contactless superconducting maglev.

However, he also mentioned that so far the team has only verified the Meissner effect, because measuring the resistance of the sample, which is only a few tens of microns, would damage the sample.

CTOnews.com Note: the Meissner effect (Meissner effect) is the repulsive phenomenon of magnetic field during the phase transition of a superconductor from a normal state to a superconducting state. It was discovered by Walter Meissner and Robert Oaksenfield (Robert Ochsenfeld) in 1933 when measuring the magnetic field outside superconducting tin and lead samples.

To put it simply, superconductors "repel" almost all magnetic fluxes in a weak field, so the magnetic line of force cannot penetrate the superconductor, so the electrical conductivity can be regarded as infinite under the Meissner effect, that is, a definition of superconductor.

In the presence of a magnetic field, the samples are cooled below their superconducting phase transition temperature. Below the phase transition temperature, the sample can cancel out almost all the magnetic field inside, and they only detect this effect indirectly.

On the other hand, because superconductors also obey the law of conservation of magnetic flux, when the field inside decreases, the field outside increases. This experiment is the first to prove that superconductors are not only perfect conductors, but also provide a unique definition of superconducting states.

It is worth mentioning that among the major institutions in the world that recreate "room temperature superconductivity", it seems that only Huazhong University of Science and Technology has achieved partial success.

Some time ago, a Wechat screenshot of Hu Xiwei, a professor at Huazhong University of Science and Technology (whose credibility is unknown), circulated online, saying that he had reproduced its magnetism, but the content of the superconducting phase was too low.

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