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Ferromagnetic half levitation of LK-99-like samples (arxiv.org)
submitted 3 years ago by to c/science@lemmy.world
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In this preprint, the authors synthesize samples based on the claimed room temperature superconductor LK-99, and observe half-levitation similar to that seen in other recent videos, which has been ascribed to the Meissner Effect (a signature of superconductivity).

However, they performed a careful magnetization measurement and found that the sample is ferromagnetic. They also did a resistance measurement on a larger sample, and found that the majority of the material is a semiconductor. This points to a simpler explanation for the half-levitation phenomenon: it is a consequence of ferromagnetism (+ mechanical effects due to friction and sample shape), rather than the Meissner Effect.

Unless someone can demonstrate full levitation or better resistivity data for LK-99, this is arguably fatal for the claims of room temperature superconductivity.

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Ferromagnetic half levitation of LK-99-like synthetic samples (arxiv.org)
submitted 3 years ago by to c/physics@mander.xyz
comment fedilink hide all child comments
 

In this preprint, the authors synthesize LK-99-like samples, and observe half-levitation similar to that seen in other recent videos. However, they perform a careful magnetization measurement and conclude that the sample is ferromagnetic. They also did a resistance measurement on a larger sample and found that the majority of the material is a semiconductor. This points to the half-levitation effect, which is mostly what got people excited, being a consequence of ferromagnetism (+ mechanical effects due to friction and sample shape), rather than the Meissner Effect.

Unless someone can demonstrate full levitation or better resistivity data for LK-99, this appears to be fatal for the claims of room temperature superconductivity.