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.
John_Hasler @lemmy.one - 2.3yr
Full levitation is not necessarily due to the Meisner effect either. It can be ordinary diamagnetism.
cyd in physics
**Ferromagnetic** half levitation of LK-99-like synthetic samples
https://arxiv.org/abs/2308.03110In 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.
Full levitation is not necessarily due to the Meisner effect either. It can be ordinary diamagnetism.