LK-99 crystal verified to be magnetically levitated (with video) | Hacker News Reader

LK-99 crystal verified to be magnetically levitated (with video)

t.bilibili.com

Under the guidance of Professor Haixin Chang, postdoctor Hao Wu and PhD student Li Yang from the School of Materials Science and Technology of Huazhong University of Science and Technology successfully for the first time verified the LK-99 crystal that can be magnetically levitated with larger levitated angle than Sukbae Lee‘s sample at room temperature. It is expected to realize the true potential of room temperature, non-contact superconducting magnetic levitation.

AI translated video: https://targum.video/v/2023/8/1/e2ad3b8e86961ccfdcf411d2d4d1...

Original video: https://www.bilibili.com/video/BV14p4y1V7kS

There's a Twitter post [0] that links to a version of this video [1] with English subtitles. Probably a better link since most HN users are English speakers.

[0] https://twitter.com/altryne/status/1686277321869975552

[1] https://targum.video/v/2023/8/1/e2ad3b8e86961ccfdcf411d2d4d1...

Can someone please explain if this is enough to prove the existence? What additional test would need to be run to be absolutely sure?

Zero resistance while conducting electricity. Levitating is nice but the important part is zero resistance.

It would be ironic if we got floating rocks but no superconductivity.

If I remember my physics classes properly, it does not. The video shows that the sample is at least paramagnetic[1], but it could also be a superconductor of type 1. I think a better test would be to see if the sample gets quantum locked [2] in the presence of a magnetic field. From [2]:

>Superconductors have one “card” in their sleeves – the ability to transfer currents without resistance. These supercurrents produce a magnetic field that interacts with the external field and are the source of the levitation and suspension forces.

If that would happen, we would definitely know this is a superconductor of type 2. If, instead, is a type 1 what we saw in the video could be just due to repulsion due to the Meissner effect [3] and having an heterogenous sample (i.e. one part is repelled more compared to the other one which points towards the magnet).

[1] https://www.britannica.com/science/rock-geology/Basic-types-... [2] https://quantumlevitation.com/what-is-superconducting-levita... [3] https://en.wikipedia.org/wiki/Meissner_effect

Am not very knowledgeable about physics and have only looked up the related concepts (so take what I say with a huge grain of salt), but doesn't the video show that it is more than paramagnetic? Because the person takes the magnet and changes its orientation, and the sample still levitates (meaning there is a good case for it being a perfectly diamagnetic?).

Again, am a just a laymen.

if the simulations are correct i expect this to take alot longer to verify even if it's legit, simply because the chance the synthesis happens properly seems to be random

Or Chinese people are good at alchemy, in fact, it is a piece of atoms put together

> it is a piece of atoms put together

As am I.

The video stopped very shortly into it for me and prompted some chinese message on the screen, just before he inserted the magnet. Has anyone got a rehosted link to the video that is less likely to get me on some kind of list?

It would be fascinating if this was legitimate.

It's a login prompt and you can close it to keep watching. But as linked in another comment, this link may be easier for non-Chinese viewers: https://targum.video/v/2023/8/1/e2ad3b8e86961ccfdcf411d2d4d1...

Thanks for that. I feel this video isn't particularly good after watching it. Surely that could be any ferrous material thats interacting with the field/inductive eddies there.

It isn't physically possible for a ferrous material to levitate above a magnet like that, when the magnetic poles are reversed. Basically you could structure it in such a way to generate a ferrous material levitating above a magnetic north pole, but flip the magnet around and you won't see the levitation. They flip the magnet around in this video.

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