3 ms·

As much as I've been following LK-99 news, this evidence is pretty meh... The video quality is poor, and they do not really demonstrate levitation. If some of

As much as I've been following LK-99 news, this evidence is pretty meh... The video quality is poor, and they do not really demonstrate levitation. If some of the sample was ferromagnetic, it would always be attracted to the magnet. If that's a small grain in the bottom side, this would explain the sample "standing up", while that side tries to become flush with the surface. I second the "break the sample up" sentiment on this one.

est 3y ago
There are three videos, 2 by HUST, one by USTC. The USTC sample could stand up on its pointy side, and wobble a bit. https://www.bilibili.com/video/BV1Ex4y1X7ix/ https://www.bilibili.com/video/BV1Ex4y1X7ix/ From my limited understanding this excludes ferromagnetism. Update: a fouth video just got uploaded. https://www.zhihu.com/zvideo/1669820225079070720 https://www.zhihu.com/zvideo/1669820225079070720 . A relatively big sample showing diamagnetism, but author says resistance is few kilo ohms
- MayeulC 3y ago
  That second (fourth) video has the same issue as the one I pointed out (possible to have this with a ferromagnetic material), but it's also possible we're seeing different things at once, or even novel *magnetic behavior. I don't have an alternative explication for the pointy side video though, so it could be Meissner effect or diamagnetism. In general it seems like diamagnetism could be consistent with all these videos? So thanks for pointing this video out :) My knowledge of these behaviors comes from what I know of ferroelectrics, which are different, and playing around with magnets like everybody (and then some), so my observations are in no way authoritative. I remain cautiously optimistic though :)
- pera 3y ago
  In the fourth video the sample appears to be levitating at 00:19 if you see the space between the shadow and the object itself, hard to tell for sure though (the surface of the table is quite porous).

est 3y ago

There are three videos, 2 by HUST, one by USTC. The USTC sample could stand up on its pointy side, and wobble a bit. https://www.bilibili.com/video/BV1Ex4y1X7ix/ https://www.bilibili.com/video/BV1Ex4y1X7ix/ From my limited understanding this excludes ferromagnetism. Update: a fouth video just got uploaded. https://www.zhihu.com/zvideo/1669820225079070720 https://www.zhihu.com/zvideo/1669820225079070720 . A relatively big sample showing diamagnetism, but author says resistance is few kilo ohms

MayeulC 3y ago
That second (fourth) video has the same issue as the one I pointed out (possible to have this with a ferromagnetic material), but it's also possible we're seeing different things at once, or even novel *magnetic behavior. I don't have an alternative explication for the pointy side video though, so it could be Meissner effect or diamagnetism. In general it seems like diamagnetism could be consistent with all these videos? So thanks for pointing this video out :) My knowledge of these behaviors comes from what I know of ferroelectrics, which are different, and playing around with magnets like everybody (and then some), so my observations are in no way authoritative. I remain cautiously optimistic though :)
pera 3y ago
In the fourth video the sample appears to be levitating at 00:19 if you see the space between the shadow and the object itself, hard to tell for sure though (the surface of the table is quite porous).