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this video sent by one of the original authors to the NY Times is the most significant peace of evidence to me: https://vp.nyt.com/video/2023/08/03/110377_1_03s
by mergejoin 3y ago
this video sent by one of the original authors to the NY Times is the most significant peace of evidence to me: https://vp.nyt.com/video/2023/08/03/110377_1_03superconductor-vid_wg_1080p.mp4 https://vp.nyt.com/video/2023/08/03/110377_1_03superconducto...
- memen 3y agoCouldn't this be explained by magnetism alone? How does it show superconductivity?
- danielbln 3y agoAbsolute layman here, but from what I've read it's supposed to show diamagnetism and the Meissner effect and flux pinning. Assuming no new weird physics, the only materials that exhibit those behaviours are superconductors.
- WJW 3y agoMagnetic levitation can't be done with normal magnets alone: https://en.wikipedia.org/wiki/Earnshaw%27s_theorem https://en.wikipedia.org/wiki/Earnshaw%27s_theorem TL;DR: Normal magnets have two poles, and will try to flip themselves around to achieve a lower energy state. You cannot levitate a normal magnet on another magnet without mechanical stabilization. Superconducting materials actively repel all magnetic field lines and can achieve levitation without external stabilization.
- DoingIsLearning 3y ago> Magnetic levitation can't be done with normal magnets alone Technically it can be done with an array of magnets with opposing polarities. Without more details from on this video's source and legitimacy, one could argue that an array of magnets is hiding under the 'single magnet' cover plate. I am not saying this is a hoax, but as exciting as this seems we just have to wait it out for more replication publications to make that call.
- drsopp 3y ago> Technically it can be done with an array of magnets with opposing polarities How?
- DoingIsLearning 3y agoAn example of Pyrolytic Carbon levitating on top of a 2x2 matrix of magnets. [0] [0] https://en.wikipedia.org/wiki/Diamagnetism#/media/File:Diamagnetic_graphite_levitation.jpg https://en.wikipedia.org/wiki/Diamagnetism#/media/File:Diama...
- yebyen 3y agohttps://www.kjmagnetics.com/blog.asp?p=electromagnetic-levitation https://www.kjmagnetics.com/blog.asp?p=electromagnetic-levit...
- hoseja 3y agoNo, it mathematically cannot be done with any combination of permanent magnets.
- gpderetta 3y agoaside from non-superconducting diamagnetic materials, I think it can be done with non-static magnets, for example: https://en.wikipedia.org/wiki/Spin-stabilized_magnetic_levitation https://en.wikipedia.org/wiki/Spin-stabilized_magnetic_levit...
- hoseja 3y agoOh of course. Brainfarted and fused "static permanent magnets" into just "permanent magnets".
- kaba0 3y agoIf we doubt the legitimacy of basic claims like a fair setup of magnets, then there are much easier ways to create a fake, like just tie something on top of it.. but why would we doubt the legitimacy of reliable institutions?
- unyttigfjelltol 3y agoWhy can't the weakly positive results be explained by an irregular formation of magnetic crystals that stabilizes the forces, in a way a single magnetic object cannot? As in, not a superconductor, just a novel configuration of magnetic particles?
- davidhyde 3y ago> “You cannot levitate a normal magnet on another magnet without mechanical stabilization” The mechanical stabilisation is right there in plain sight where one side of the magnet is clearly resting on the other magnet (physically in contact). Anyone who’s played around with magnets that are heavy and too weak to flip themselves around will not be satisfied with this video. It could be explained by two South Poles opposing each other.
- zarzavat 3y agoIt’s not proof of anything, but it’s suggestive. The only other known materials that show that degree of diamagnetism are superconductors. That magnet is tiny!
- pouulet 3y agoThis man claims to have reproduced the same kind of effects with a simple ferromagnetic sample: https://nitter.net/VanGennepD/status/1688052003216261120 https://nitter.net/VanGennepD/status/1688052003216261120
- deleted 3y ago[deleted]
- drexlspivey 3y agoexcept he didnt reverse the poles of the magnet like multiple replication videos so he didnt really reproduce the same effect
- neuah 3y agoDo you mean flipping the magnet over? If you scroll down he did that.
- macromaniac 3y agoThe picture on figure 4 of this paper rules out ferromagnetism, assuming it's legit https://arxiv.org/pdf/2308.01516.pdf https://arxiv.org/pdf/2308.01516.pdf
- Jweb_Guru 3y agoPeople seem skeptical that it's actually been ruled out by that test. Regardless, that paper found diamagnetism on the level of pyrolytic graphite, which would be interesting in this material albeit not really evidence of superconductivity, but from what I've heard it is very easy to get anomalous reports of diamagnetism during zero field cooling if there is a high-temperature ferromagnetic transition, and you have to be extremely careful about your measurements and do lots of repeated tests to be sure. AFAIK, every other paper has either only seen very weak diamagnetism (expected given the compounds involved) or none at all.
- junon 3y agoThat is a MASSIVE piece of LK99 if it is true. Any information on source? Any details?
- josalhor 3y agoSource is HT Kim shared on NYTimes: https://www.nytimes.com/2023/08/03/science/lk-99-superconductor-ambient.html?unlocked_article_code=1RFsvH3_3gc3a53X5ODw9MQ0dPhZKWCfS6XONy_SDVqOSwhBxDO65hnRVRgkhB7qaufwmIO9jZR8WjB5ZulcNiZ9H1hpyaDKJE25iHNWUFVokh208asy0oT-5OQ-asT1sKXAGcKdEtIscaox7nlHFnnPO467Sfr6KQZywb35LcOCobs1R651b9ei_PaUO414mkedhIQZPRPg72gHpRfttUaQjnOZcIa9etr0Cpib9ZbVSQmLA78ZXqVpL6hyESeEH-FzXCVzIoxzjroKtxxdbnBYVkpSlgrL7HUXkLFIZkPbjBddXuX72jeQm8-RXUdChVmGjKTgpZ3f5I0X_4-8GyGS25Nxbg&smid=url-share https://www.nytimes.com/2023/08/03/science/lk-99-superconduc...
- deleted 3y ago[deleted]
- f6v 3y agoSuppose they have a room temp superconductor(even if it’s not pure). What’s stopping them from revealing the process? It seems like the way they describe it is extremely hard to reproduce. So, are they trying to figure out how to make the most money off it? What else could it be?
- ajmurmann 3y agoThe steps are public. Famously the catgirl-boyfriend in Russia ignored them and came up with alternative steps to reproduce on their kitchen counter. However, it's very hard to get right and the original authors also needed many attempts and still had impurities.
- unaindz 3y agoThey don't necessarily need to know what makes it work, they may do it ten times following the same recipe and it works only one of those times. The first method used to get a new material is usually not the best one, some iteration is needed.
- titzer 3y agoI get that the manufacturing process doesn't produce pure samples, and that it's highly likely that the sample has many "islands" of the right lattice structure within it, of various sizes and shapes. What I don't get is why they don't just pulverize the sample, put it in a magnetic field, and then sift out the floaty particles. Things floating at an angle and halfway make me very suspicious. Also, why are all these videos like 5 seconds long? The stuff is supposedly superconducting at room temperature and would supposedly float indefinitely. Why not just put up a 24/7 livestream, do stuff like pass strings/paper/loops/etc around it. I think this material is very interesting, but all the videos I see are so clownish that I am getting more skeptical as time goes on.
- BasedAnon 3y agoit's possible pulverizing it would destroy the structure that allows this to happen in the first place