First video of LK-99 Full Levitation with flux pinning. The video was posted to the Chinese video-sharing site BiliBili and claims to be a highly pure synthesized sample of LK-99.
UPDATE- Report that this was faked
Update on fake Chinese replication video of #LK99 showing complete levitation
The poster has said on their Weibo that they faked it for the hype and apologized, hmm what did I tell you https://t.co/dL3HVGcghw pic.twitter.com/bi4nbgBTFr
— Elsa Zhou (@elsa17z) August 7, 2023
Here is the Bilibili version of the video.
Either this is a very well-done fake, or we really did just enter the era of room temperature superconductors. What is seen here (stable levitation above a dipole magnet) can *only* be a result of flux pinning. If the sample was a previously known low temp SC that had been… https://t.co/BuMt6L9k1h
— Andrew Higgins (@A_J_Higgins) August 5, 2023
Given time and resources, any chemist or material scientist could reproduce it. If it's real, the cat is out of the bag.
— Andrew Higgins (@A_J_Higgins) August 5, 2023
First video of LK-99 Full Levitation, aka flux-pinning
This video was just posted to the Chinese video-sharing site BiliBili and claims to be a highly pure synthesized sample of LK-99.
What is the physical phenomenon behind this and what does it mean?
Levitation of… pic.twitter.com/KGRhGjtrOy
— Andrew Cote (@Andercot) August 5, 2023
Note that this orientation of magnets on the bottom produces whats called a 'dipole field', like that of a bar magnet. If the material on top was a simple diamagnetic, then it is physically impossible for it to stably levitate, especially when poked by the stick.
This is from a…
— Andrew Cote (@Andercot) August 5, 2023
Here's a video of a more traditional SC sample which is cooled down, showing the same kind of shakiness when slightly perturbed. pic.twitter.com/PguemytbGn
— Andrew Cote (@Andercot) August 6, 2023
The attached tweet shows a video of what would be the world’s first fully levitating LK-99 superconductor sample.
I am leaning towards there being some validity to the video, because the uploader “炼丹师阿翔” had previously documented another replication attempt of his which… https://t.co/5EndkKfRJs pic.twitter.com/oAIdM9Aojv
— Floates0x (@floates0x) August 5, 2023
I figured that pinned vortices take quite some depinning force to be moved away from their pinning centres, hence for small movements it rather snaps back than relocate pinned vortices. If I recall correctly this snapping back is what we want.
— Jorrit de Boer (@JorritdeBoer) August 5, 2023
Another copy of the video is from douyin.com.
Unverified fully levitating #lk99 from China pic.twitter.com/MF9744UAeM
— LERE (@lere0_0) August 5, 2023
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Yes, that definitely looks like flux pinning, which is a pretty definitive test for type 2 superconduction.
It could still just be an extremely good diamagnetic material (better than any previously discovered non-superconductor). You can levitate pyrolytic carbon above a regular neodymium magnet and it looks very similar to this except for the fact that the restoring force is much weaker; so if you push it out of position it spins and wobbles for quite a bit while coming back to its resting position. Not sure you could tell much of a difference between an Xv of 0.1 and 1.0.
Authenticity could not be confirmed.
Per Elsa zhou the wuhan student denied sending this video, so assume this is a fake for now