--- Log opened Mon Jul 31 00:00:15 2023
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05:05 < L29Ah> .t https://eirifu.wordpress.com/2023/07/30/lk-99-superconductor-summary/#sbtable
05:38 < fenn> imagine going to all that trouble and not even explaining what the hell is in the picture
05:40 < fenn> presumably this image shows some kind of glass (?) tube with a diagonally cut end holding a tiny chunk of LK-99 or something similar, levitating over a magnet https://nitter.nl/pic/orig/media%2FF2TrDZ2W8AE8Kut.jpg
05:40 < fenn> source: the last entry on the list linked above. https://nitter.nl/iris_IGB/status/1685731177523449856#m
05:48 < fenn> heh "We need to make 96 plate crucibles"
05:48 < fenn> (do 96 variations in parallel)
05:50 < hprmbridge> yashgaroth> I do wish the koreans would break their disc so that the thinner half has a chance to levitate on its own. Not that I knew what flux pinning was a few days ago
05:51 < fenn> "I also don't like burning phosphorus. Reminds me of my childhood too much." :(
05:52 < L29Ah> not sure if red phosphorus matchboxes or white phosphorus munitions
05:52 < hprmbridge> yashgaroth> breaking the material into tiny chunks and sifting out the ones that levitate does make sense if the synthesis is generating tiny heterogeneous superconductive regions in the bulk material. "I wish the russian catgirl would post a video" is not a sentence I ever expected to type, but here we are
06:01 < fenn> it's frustrating that they don't understand the reason someone might want a video
06:08 < nsh> no, it's frustrating that these reasons exist
06:08 < nsh> on balance i'm going to side with the frustrations of the person who did the worthy thing
06:10 < fenn> they dislike the "tone" of video, and they want to write a text based article instead
06:11 < fenn> it's not about gender politics or whatever the fuck you're assuming
06:11 < fenn> the reason to provide a video is so we can see the behavior of the material
06:11 < fenn> viewers can verify that it is in fact levitating and not sticking to the inside of a plastic straw by electrostatic attraction
06:12 < fenn> i.e. confirm that it is actually a replication
06:27 < hprmbridge> alonzoc> If it's a 1D super conductor that's got a bunch of interesting possible implications
06:27 < fenn> what's the difference?
06:28 < hprmbridge> alonzoc> Well Meissner effect would be lesser. But afaik depending on how your 1D fibers of super conductor are threaded throughout your bulk material you could get lots of different properties
06:28 < fenn> i thought the general idea of superconductors was that electrons travel in a straight line unimpeded instead of bouncing around
06:29 < hprmbridge> alonzoc> Yeah but 1D super conductors would be that there's only one (well two forward and backwards along that direction) direction it can travel in such a straight line
06:30 < fenn> there are usually only a small number of directions anyway, due to the crystal lattice symmetry
06:31 < fenn> so even in a "3D" superconductor, electrons would have to stop, turn the corner, and then go in a very different direction
06:32 < fenn> do superconducting coils emit x-rays?
06:34 < hprmbridge> alonzoc> Yes but when you consider the macroscopic bulk it's effectively just zero resistance in any path along the bulk, it's not really as simple as electrons just traveling in straight lines there's lots of macroscopic quantum behaviour. However in a 1D super conductor this wouldn't be true, So things like an eddy current from a magnetic field wouldn't be induced in the same manner as it is in a bulk
06:34 < hprmbridge> alonzoc> superconductor, it'd be like wood grain with zero resistance along the grains
06:34 < hprmbridge> alonzoc> Afaik I might be wrong
06:34 < hprmbridge> alonzoc> It was thought 1D superconductors were impossible
06:34 < hprmbridge> alonzoc> So...
06:35 < nsh> (it's not especially helpful to think of electrons having anything to do with corners
06:35 < hprmbridge> alonzoc> There's some stuff about quasi1D
06:35 < nsh> it's a wavefunction)
06:36 < fenn> photons reflect, and they're also wavefunctions
06:36 < nsh> (neither can they stop, because position and velocity are conjugate variables)
06:36 < fenn> you know what i mean
06:37 < nsh> perhaps :)
06:38 < nsh> perhaps a way to think about it is that in order to have eddies you require divergence
06:38 < nsh> and that is a phenomenon that doesn't manifest in one dimension
06:38 < nsh> as alonzoc says, effectively
06:39 < hprmbridge> alonzoc> That's a good explination. But also being able to modify the 1D grain structure has a bunch of interesting design directions
06:39 < nsh> well, it might be analogous to flux tubes considered in a limit as strings, so you could get reconnection potentially
06:39 < hprmbridge> alonzoc> I think curl is what you were meaning tho
06:39 < nsh> but idk, that's a wild ass guess
06:39 < nsh> to quote fenn, you know what i mean :)
06:40 < hprmbridge> alonzoc> Yeah.. I worry "inter fiber" resistance might be to low to be sufficiently useful
06:41 < hprmbridge> alonzoc> The "dream" would be a bulk material filled with coaxial superconducting filaments so you could completely get around flux saturation
06:41 < fenn> they're building a superconducting tokamak with copper connectors between coil segments. it's fine
06:41 < fenn> oo coaxial, that's smart
06:43 < fenn> what's the problem that a bulk superconducting material solves that a bunch of wires doesn't solve?
06:44 < hprmbridge> alonzoc> Nothing much easier to levitate bulk. But if you instead just have tons of small superconducting loops in your bulk material you should get levitation
06:44 < hprmbridge> alonzoc> You just won't get a good conductor just a levitation optimised material
06:45 < fenn> isn't a coil the best for levitation?
06:45 < fenn> or three coils if you care about rotation
06:47 < hprmbridge> alonzoc> You'd have millions of embedded superconducting loops, and orientation can be chosen. But I'm not sure if you get much benefit from coils in the material at this point as 1000 closed super conducting loops should be eq to 1000 turn super conducting closed coil. With only a difference in manufacturing tolerance
06:47 < hprmbridge> alonzoc> That's the other interesting point, if you control the orientation of the loops you could have one orientation of flux locking be privileged
06:48 < hprmbridge> alonzoc> So it only opposes magnetic field lines aligned perpendicularly to the microscopic loops in the material
06:49 < hprmbridge> alonzoc> To achieve all of these promises would require a great deal of manufacturing control
06:54 < nsh> would the phase inside each of the loops constitute a fluxon (Abrikosov vortex)?
06:57 < hprmbridge> alonzoc> I guess so
06:57 < hprmbridge> alonzoc> I'm not totally sure, though they'd be analogous tho
06:59 < hprmbridge> alonzoc> I'm also thinking about the whole "current biased annealing" idea again
07:00 < hprmbridge> alonzoc> If Lk99 is a 1D SC then current biased annealing might be useful to align the "grains" in some preferred direction
07:03 < fenn> it would be awkward if you got 100% grain alignment but it wasn't perfectly colinear with the macroscopic wire, so all your electrons bunched up on one side of the wire
07:04 < fenn> they would have to travel around the wire sheath to get back to the other side to continue along the misaligned path
07:07 < hprmbridge> alonzoc> that'd be interesting
07:30 < fenn> "For years, the only food in which the FDA had established a maximum level of lead was candy: 0.1 parts per million for small children."
07:31 < fenn> for years we've been sold the idea that the FDA establishes regulations to keep poisonous adulterants out of food
07:32 < fenn> isn't regulating lead levels the bare minimum they could do to justify their existence?
07:49 < L29Ah> lead is a very handy thing to regulate since it has no safe dose apparently, and of course everything is contaminated with lead to some degree
08:23 < docl> I got a lead ingot from amazon
08:23 < hprmbridge> alonzoc> You got the equipment for synthesis?
08:24 < docl> nope, just bought $100 worth of stuff from amazon to roll my own experimental route
08:24 < hprmbridge> alonzoc> Sounds like a plan
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08:26 < docl> some petri dishes, alligator clips, batteries. still trying to figure out how I'll approach quality control, ideally I want exact Pb / Cu / PO4 ratios in my layers
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08:30 < L29Ah> tfw in moscow i could buy all the stuff needed to replicate the published synthesis route OTC, while in montenegro i can only drool
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12:12 < kanzure> docl: maaku has been chatting with philipturner if you want to ask anything
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21:06 < docl> kanzure: very cool, will try to think of some questions for maaku
21:06 < docl> diamondoid simulation vidya https://twitter.com/philipturnerar/status/1685855772985487360
21:10 < docl> looks like there was a unit conversion error causing it to show the results for km/s instead of mm/s, they are actually a lot stiffer
21:11 < docl> new lk-99 paper dropped, simulation seems to confirm superconductivity https://arxiv.org/abs/2307.16892
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--- Log closed Tue Aug 01 00:00:15 2023