- #36
romsofia
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That may be true for electrical and transport applications, but it could well be a benefit to information processing or instrumentation.fluidistic said:It is said that if such a cuprate was found, it would be of little use, due to low I max.
I can make it consistent, by reverse sorting the dictionary, which would help to get an earlier retraction.Vanadium 50 said:Except in the dictionary, confirmation comes before application.
Worked (possibly) for J/Psi.Vanadium 50 said:Here's another thing that bugs me "LK"? Really? They named it after themselves? Not only is it worth 20 points on the Baez Index, do they not remember the GFAJ-1 fiasco?
Vanadium 50 said:This didn't happen with the last time we had the first room temperature superconductor, the Indian gold-silver amalgam. Or maybe it was the time before that.
Does this pass the smell test? It's pretty stinky. Doesn't make it wrong, but...
You may be sensing a theme.
- The paper, as stated, is not very good. Doesn't make it wrong, but...
- The evidence plots are, at least to me, not so clear. Doesn't make it wrong, but...
- The authors' publication history is not in experimental superconductivity - it appears to be more in theory, and non-SC theory dominates. Doesn't make it wrong, but...
- The research was apparently conducted at a commercial company, This appears to be the very first paper out of this company, at least in English. Doesn't make it wrong, but...
- The idea of increasing the internal pressure by substitution is not new. It has had some success in the past, but nothing like this. Doesn't make it wrong, but...
- The authors claim to have a new family of materials. The first and thus far only member of this family has the property of interest. Doesn't make it wrong, but...
We successfully synthesized polycrystalline LK-99-like ceramic samples with a solid-state-sintering method. Powder X-ray diffraction shows that the main contents are Pb10−xCux(PO4)6O and Cu2S, consistent with recent reports [arXiv:2307.12037; arXiv:2308.01192]. In some small flaky fragments, we successfully observed ``half levitation'' atop a Nd2Fe14B magnet. Using magnetization measurements on such small pieces, as well as on a large piece which does not exhibit the half levitation, we show that the samples ubiquitously contain weak yet definitive soft ferromagnetic components. We argue that, together with the pronounced shape anisotropy of the small fragments, the soft ferromagnetism is sufficient to explain the observed half levitation in strong vertical magnetic fields. Our measurements do not indicate the presence of the Meissner effect, nor zero resistance, in our samples, leading us to believe that our samples do not exhibit superconductivity.
Multiple groups reproduced the claimed "levitation" with ferromagnetic elements and the sudden resistance drop seems to come from copper sulfide undergoing a phase transition.Instead, studies have shown that impurities in the material — in particular, copper sulfide — were responsible for the sharp drops in electrical resistivity and partial levitation over a magnet, which looked similar to properties exhibited by superconductors.
But if it sticks to the fork doesn't that mean it is a superconductor?Vanadium 50 said:Well, it sounds like we can stick a fork in it. At least until next time.