1. In this paper, the lead apatite superconductor LK-99 was successfully synthesized for the first time. It has a slightly modified hexagonal crystal structure and can work at room temperature and atmospheric pressure.
2. The superconducting characteristics of LK-99 were confirmed by the tests of critical temperature (Tc), zero resistance, critical current (Ic), critical magnetic field (Hc) and Mesner effect.
3. The superconductivity of LK-99 comes from the fine structure distortion caused by volume shrinkage (0.48%) caused by Cu2 ++ ions replacing Pb2 ++ ions, but not the external temperature and pressure.
4. The stress caused by volume shrinkage acts on the interface of hexagonal cylinder with space group P63/m and point group 176, which distorts the interface. The parameter is a=9.843? And c=7.428? Compared with lead apatite, the lattice parameter is a=9.865? And c=7.43 1? LK-99 contracted slightly. Therefore, the generated internal stress is in phosphate ([PO4]3? A heterojunction quantum well is generated between Pb and O in) through a one-dimensional chain, which limits the disturbance of electrons, thus generating a superconducting quantum well (SQW).
5. The results of electron paramagnetic resonance confirmed the existence of SQW in LK-99. The way to achieve this is to significantly limit the number of electrons that can be dynamic, that is, the disturbance of electrons in the lattice slows down, and the electrons in this state must be in a dynamic equilibrium state where the electron-electron Coulomb interaction is frequent enough to show liquid properties. Superconducting electrons may be conducted through the tunneling effect between SQW, making the resistance zero.
6. The author thinks that when LK-99 thin films are deposited on nonmagnetic copper samples by chemical vapor deposition, the response of LK-99 to magnetic field may be Mesner effect. Pure lead apatite is an insulator, but the author claims that LK-99 formed by copper-doped lead apatite is at an appropriate temperature (
On "Korean Room Temperature Superconducting Paper"
On July 28th, Professor Wen from the School of Physics of Nanjing University told the technology of "If you can win the Nobel Prize immediately", "It's really lively, but it's not surprising because it's very important." "Most people don't do superconductivity."
"We have carefully analyzed their data, and three aspects-resistance, magnetization and so-called magnetic levitation-are not enough to show that it is a superconducting phenomenon (material)." "Our judgment (its so-called superconductivity) is probably an illusion."
Regarding the repeated experiment, Wen said, "In fact, we didn't want to do it, because we judged that it was not like superconductivity, and later we sent a classmate to do it. Many groups in the world are repeating it. According to our experience, (the data published in the current paper) is not enough to show that it is superconducting. "