10 ms·
LK-99: Phonon bands, Localized Flat Band Magnetism, Models and Chemical Analysis
- carabiner 3y agoX link with findings summary (not a superconductor): https://nitter.net/i/status/1689014160477261825 https://nitter.net/i/status/1689014160477261825
- ChatGTP 3y agoTwitter is where science is done now...
- jiggawatts 3y agoYou mean 𝕏 is where science is done now?
- readyplayernull 3y agoThey need to drop twitter.com first...
- bottlepalm 3y agox.com works right now.
- pizza 3y agoThe most expensive HTTP 302 of all time, apparently.
- bottlepalm 3y agoThere's a lot of value in typing 6 less characters.
- ChatGTP 3y agoIt's a redirect to twitter.com
- bottlepalm 3y agoFor now..
- hanniabu 3y agohow'd you get that symbol?
- latchkey 3y agoCreate text replacements On your Mac, choose Apple menu > System Settings, then click Keyboard in the sidebar. (You may need to scroll down.) ... Click Text Replacements on the right. ... Click the Add button on the left, type the text to replace (such as teh) and its replacement (such as the), then click Add. Click Done.
- jvm___ 3y agohttps://www.compart.com/en/unicode/U+1D54F https://www.compart.com/en/unicode/U+1D54F It's in with the 150,000 characters included in Unicode. Unicode includes like 150 languages going all the way back to cuneiform.
- timeon 3y agoFrom X.org
- drtgh 3y agoPeople should refuse to help a company to appropriate a letter of the alphabet as a brand for its company. I think that correcting others and guide them towards such letter contributes to what the company may be desiring. May be should be the contrary, when one see other referring that company with the letter should be corrected? Or may be, if they success with the appropriation at future, we should gift the company with an noun, like Xdumb, or Xpeculation channel, or so?
- dekken_ 3y agoThis one? ;) https://en.m.wikipedia.org/wiki/%C3%89cole_polytechnique https://en.m.wikipedia.org/wiki/%C3%89cole_polytechnique
- groby_b 3y agoYes. Has been for a while. Before that, listservs. (OK, they're still with us) Science is a team sport, and so it is grounded in communication. The faster, the better.
- m3kw9 3y agoWhat’s not a superconductor? His sample or all lk99s?
- carabiner 3y ago"Together, these calculations suggest it is doubtful that Cu enters the structure in meaningful concentrations, despite initial attempts to model LK-99 in this way." So does this mean all those DFT calculations were useless?
- denhaus 3y agoIt may mean the structure of LK-99 found by Kim et al is highly metastable. It does not mean the DFT calculations were useless. Also, for clarity, the original DFT calculations by Griffin do not purport to have “verified” superconductivity, but rather just report to have found a band structure (electronic energy levels) which are encouraging.
- delabay 3y agoThe DFT calculations were performed on a phase which is not possible to form via the recipe provided by the Korean team, as demonstrated by this latest preprint. Which raises doubt on what the Korean team actually tested or whether they are withholding alternative recipes.
- XorNot 3y agoThere's a difference between "can you actually form this structure" and "if you could form this structure, what would it's properties be?"
- physicsguy 3y agoThink of it in terms of an energy barrier, like someone cycling over Everest. It might be theoretically possible that there's a nice happy superconducting state if you can get things in the right place, but if you've got to cycle over the top of Everest, it might be pretty much impossible to get there.
- dmarchand90 3y agoDamn, looks like it's a no then :(
- denhaus 3y agoI wouldn’t say a “no”, just a failed replication. Though it’s not encouraging
- jacquesm 3y agoNo, it's not a yes. And it could easily stay that way.
- andy_ppp 3y agoIt seems to me there’s also not nothing here too. There seems to me some bits of superconductivity and maybe even if it doesn’t work it will lead to something more.
- ayakang31415 3y agoAs I feared, it is no use at all at this stage to claim anything about LK-99 as every synthesized LK-99 seems different each time. We have to have a thorough analysis on the sample directly provided by Lee and Kim.
- Accujack 3y agoOr everyone has to wait for the full paper to be released which supposedly includes some manufacturing steps not included in the leaked paper so that replication can happen properly. The original samples are now under testing at a national lab in SK.
- brucethemoose2 3y ago> We have to have a thorough analysis on the sample directly provided by Lee and Kim. Even this sample could be marginal, going by the original paper. But there has been plenty of "locked" levitation and lots of zero conductance failures. I believe LK-99 a finicky topological superconductor thats going to give researchers headaches for years, not something that will suddenly be a bulk superconductor with just the right synthesis in the coming months.
- whatshisface 3y agoLevitation with a corner touching the magnet can be accomplished by iron. It's what iron filings do when you put them on a magnet!
- brucethemoose2 3y agoThere have been multiple videos of tiny LK99 specs completely levitating on single magnets, and resisting motion when pushed, and staying afloat when the magnet is inverted. That is not possible in any known material. Unless thats an array of very elaborate fakes, its a RT superconductor. But the simulation papers and conductance tests make me suspect its a topological superconductor that would fail such tests.
- 3y ago
- donate1992 3y agoWhile structure may play a role, the problem is that many researchers around the world have yet to confirm superconductor properties.
- m3kw9 3y agoIncluding original authors
- Solvency 3y ago[flagged]
- cptaj 3y agoI wouldn't say they fell for anything. The scientific world went on overdrive and tried to verify the finding exactly as it should. They didn't blindly believe in anything.
- postalrat 3y agoDo you have some special power to know the truth before anyone else?
- pessimizer 3y agoWhoever told you you need special powers to sometimes correctly evaluate things before most of the internet catches up has a unique definition of "special powers."
- mikhmha 3y agoYou see this type of stuff enough it’s all the same. People are what drive the hype and what motivates people to lie, cheat, etc is the same no matter where you go or what year it is. Or maybe it’s because I’ve been burned enough times by hype cycles and magical thinking in my youth I have developed some skill for this. You gotta get burned a few times to understand. of course you need to be careful. Check yourself. I’m not some perma-skeptic or contrarian. But if it quacks like a duck…
- Solvency 3y agoNo, my special power is extreme cynicism, which works 99.99999999% of the time.
- slt2021 3y agoCynics don't create anything new, they can only say No and smear other people's work without lifting a finger. Creating something new requires to have more positive and optimistic attitude, these people make things happen and make the world a little bit better.
- floxy 3y agoThis version of LK-99 is transparent? Have any of the other groups attempting replication noted the transparency of the material?
- luckystarr 3y agoI reckon the sample was just thin enough.
- svnt 3y agoA dismissal coached by a theoretical physicist (Bernevig [0], the others appear to be students or postdocs) whose job it is to predict superconductors. At least two reactions come to mind: 1) If his models could predict useful room temperature superconductors, it seems we would have found one already. 2) If his models don’t agree with LK-99 being a superconductor, and it ends up being one, he probably has a lot of revision to do. I’m not an expert, but doesn’t it seem likely that finding a room temperature superconductor at this point would involve effects or combinations of effects that we don’t have a good theoretical framework for yet? [0] https://phy.princeton.edu/people/bogdan-bernevig https://phy.princeton.edu/people/bogdan-bernevig
- throwawaylinux 3y ago> 1) If his models could predict useful room temperature superconductors, it seems we would have found one already. How do you arrive at this?
- zekrioca 3y agoThen they go on to say > I’m not an expert, but..
- svnt 3y agoI’m confused how you think it doesn’t follow? Maybe our conception of model is at differing levels? I’m saying that if their models worked in a predictive way, since they have been established for so long and the value of confirming them is so high, they would have been confirmed by now.
- wardedVibe 3y agoThink by analogy with NP. Finding the solution (the right configuration of matter) is quite difficult compared to analyzing one that's been put in front of you.
- deleted 3y ago[deleted]
- arpowers 3y agoWell written article, the conclusion is a bummer to me… suggesting again that analysis leads to the ferromagnetic conclusion… Perhaps the original authors didn’t realize that and got over excited… then fell victim to confirmation bias elsewhere… I still have some hope!
- marsven_422 3y ago[dead]
- carabiner 3y agoBros, it's over: https://news.ycombinator.com/item?id=37058051 https://news.ycombinator.com/item?id=37058051 The apparent drop in resistivity originally shown by the Koreans can be attributed to the Cu2S phase change. The crystal structure changes with temperature, and that changes its conductivity. The resistivity never becomes zero but drops sharply to near-zero. It's so cleanly explained, I can't believe it's not over so it has to be over.
- teekert 3y agoSabine remains skeptical: http://backreaction.blogspot.com/2023/07/lk99-new-room-temperature-superconductor.html http://backreaction.blogspot.com/2023/07/lk99-new-room-tempe... Edit: apologies, meant to link to this more recent update (still skeptical): http://backreaction.blogspot.com/2023/08/superconductor-lk99-update.html?m=1 http://backreaction.blogspot.com/2023/08/superconductor-lk99...
- whimsicalism 3y agoThis is from 9 days ago. That said, the case against has only gotten stronger in the intervening time with the Peking paper.
- teekert 3y agoApologies, I meant to link: http://backreaction.blogspot.com/2023/08/superconductor-lk99-update.html?m=1 http://backreaction.blogspot.com/2023/08/superconductor-lk99...
- oersted 3y agoShe uploaded her weekly news video yesterday. Seems to remain skeptical but not openly so, simply highlighted that most replication attempts are inconclusive or failed, and commented on some of the new papers (thr DFT theoretical one, 100K SC one...).
- LatteLazy 3y agoReading about this reminds me of carbon nano tubes and graphene: extremely interesting and useful properties but no reliable, reproducible mass manufacturing techniques mean we have no (or only very very limited) real world applications. I hope LK99 does not end up in the same place...