"Accomplished by a team at the Huazhong University of Science and Technology and posted 30 minutes ago.
Why this is evidence: The LK-99 flake slightly levitates for both orientations of the magnetic field, meaning it is not simply a magnetized piece of iron or similar ‘magnetic material’. A simple magnetic flake would be attracted to one polarity of the strong magnet, and repelled by the other. A diamagnet would be repelled under either orientation, since it resists and expels all fields regardless of the polarity.
Caveats There is no way to verify the orientation of the strong magnet in this video, also, there are yet to be published experimental measured values of this sample. Diamagnetism is a property of superconductors but without measured and verified data, this is just suggestive of a result.
Take-away If this synthesis was indeed successful, then this material is easy enough to be made by labs other than the original research team. I would watch carefully for results out of Argonne National Lab, who are reported to be working on their own synthesis of a sample.
This overall corroborates two independent simulation studies that investigated the original Korean authors claim about material and crystal structure, and both studies supported the claims.
Lawrence Berkeley National Lab: https://arxiv.org/pdf/2307.16892.pdf Shenyang National Lab: https://arxiv.org/pdf/2307.16040.pdf "
You’re kind of discounting the concept of credibility. People make all sorts of wild claims—far too many to actually test them—so it’s necessary to weed out claims that aren’t credible by looking at things like how well the claims are presented. A new theory in physics will be ignored if it’s written in crayon in scraps of trash, as it should be.
Obviously the recent claims about superconductivity are a lot more credible than that, and a bunch of researchers around the world have decided their claims are worth testing, but there’s nothing wrong with tempering your optimism in response to a paper that seems a bit dodgy. It’s not unreasonable to suspect that researchers who can’t get their shit together enough to release a paper without drama might also have trouble getting their shit together enough to conduct research without making critical mistakes.