The suspicion of room-temperature superconductivity that has caused a sensation in the global scientific community may be another "wolf is coming" story.
After many research institutions around the world failed to reproduce the so-called room-temperature superconductor LK-99 conducted by Korean researchers, South Korea's local superconducting research institutions reviewed the project and finally concluded that, based on the existing evidence, it is impossible to Prove that LK-99 is a room temperature superconductor.
According to Yonhap News Agency, the "LK-99 Verification Committee" established by the Korean Superconducting Society stated that no "Meissner effect" was observed in the videos and papers related to LK-99.
The so-called Meissner effect, that is, the unique "complete diamagnetism" of superconductors. Ordinary materials are in a magnetic field, and the magnetic force lines usually pass through them, but the magnetic field inside the superconductor is always equal to 0, which can bounce the magnetic force lines away and suspend them in the air.
The levitation video of LK-99 is far from the magnetic flux pinning effect. The video shows that the LK-99 is not stable when levitating and will keep shaking in the air. In addition, the LK-99 research team also admitted in a paper uploaded to arXiv that when reacting with a magnet, only a part of the sample can be suspended in the air, not the complete sample. The verification committee believed that the sample might simply be moving away from the magnet due to diamagnetism, rather than exhibiting the Meissner effect.
In addition, the verification committee noted that the data in the paper also differ from typical superconductor diagrams. For superconductors, the magnetic susceptibility returns to zero at the critical temperature, but LK-99 shows a negative value.
The verification committee believes that the magnetic susceptibility change diagram of LK-99 also only shows diamagnetism, and many materials that are not superconductors also have diamagnetism.
"Our position has not changed and the current data are insufficient to prove that LK-99 is a room temperature superconductor."
It is worth pointing out that the above verification was carried out without contact with LK-99 samples.
The Verification Committee has requested the team of the Korea Institute of Quantum Energy Research to provide LK-99 samples, but the team said that because the submitted papers are under review, the samples cannot be provided for the time being, and they need to wait until the review is completed, which may take 2-4 weeks.
The members of the verification committee interviewed said that once they can touch the sample, they only need to measure its magnetic susceptibility and resistance to see if LK-99 has the complete diamagnetism and zero resistance of a superconductor, and the truth will soon be revealed.
