scarmig

46 ms·

601.
by scarmig 3y ago
Buy a copy of Kittel and read it? His superconductivity chapter is okay enough and only like 50 pages. I know that's not too helpful, but it's hard to offer much of anything if you don't share what you're struggling with
602.
by scarmig 3y ago
I'm generally anti-patent, but if there were any valid case for patents, this is it. Long, hard labor to discover something entirely new that has massive uses for society. I'd rest my hopes on them not being dicks about it, not on
603.
by scarmig 3y ago
Nope. Quantum computing requires low temperatures not because of resistance but to maintain coherence.
604.
by scarmig 3y ago
Yeah, apparently wrong. Not a lawyer, obviously, recovering physicist/current SWE.
605.
by scarmig 3y ago
Ah, teaches me to try to be lawyer :) The patent is here for reference: https://patents.google.com/patent/WO2023027536A1/en And yeah, they left off Au.
606.
by scarmig 3y ago
I'm sure it depends on jurisdiction, but in the US, you can't patent a material, only a method to make it. If I recall correctly, their patent for method covered a wide range of constituent elements, but left off gold. I would fee
607.
by scarmig 3y ago
326K (+127 deg F) and 340K (+152 deg F) for their less and more pure samples respectively. And, yes, if it's a superconductor as we understand them, that's the temperature at which it would have zero resistance as well.
608.
by scarmig 3y ago
The paper shows a clear phase transition to diamagnetism as the material is cooled. That would be seen in superconductors and not in regular diamagnetic materials. I'm not aware of any that have that kind of phase transition. Though si
609.
by scarmig 3y ago
There's not going to be a poll on it or anything. But, for what it's worth, as both an LK-99 optimist and as someone who has worked in the field and who still talks to people in it, most people in it seem to put the chances well b
610.
by scarmig 3y ago
pg: "Being too cynical will cause you to miss out on the most important phase changes." Defaulting to "no" might get you the right answer the majority of the time, but it also makes you miss the times that "yes&quot
611.
by scarmig 3y ago
> Disagree re: the not getting how science works, though you might be facetious? Mostly tipsy facetiousness. I mostly wanted to mock the people who thought the DFT analysis was strong evidence that LK-99 is actually a superconductor. Of
612.
by scarmig 3y ago
Spicy take: Theory is shit (betraying my bias here). If someone released a paper that theoretically proved a material was a superconductor from first principles, I would ignore it, every bit as much as I would if it had the opposite results
613.
by scarmig 3y ago
Usually superconductor resistance is measured using four probes: current goes through the two outer probes, and voltage is measured across the two inner probes. Then V=IR. Lead resistance can play a role, but superconductivity is a phase tr
614.
by scarmig 3y ago
Bismuth is a strong diamagnet, and it can enter a superconducting state (at a fraction of a degree above zero), so it's not impossible. (And lots of materials are weak diamagnets and superconduct at some point.) So it wouldn't be
615.
by scarmig 3y ago
Interesting. Some people are getting strong diamagnetism at RTP, and now someone is actually seeing zero resistance at a low temperature. I'd take this as mildly positive news. It would be a surprising material if it were a high Tc (on
616.
by scarmig 3y ago
My new start-up, Super Conducting Artifical Minds, is releasing a new coin that allows zero resistance neural network computation on the block chain. Get in on it now and you can make millions in passive income!
617.
by scarmig 3y ago
Registered Tax Return Preparers.
618.
by scarmig 3y ago
"Guardedly optimistic"!
619.
by scarmig 3y ago
There's also the possibility that the original team is deceiving themselves. By all appearances, they're deeply committed to this result (that could be an act, but that's not the sense I'm getting). But those biases coul
620.
by scarmig 3y ago
There's liberalism as a political theory (with all its variations, from classical to Rawlsian), which is admirable and distinct from Maoism. But there's also the "liberalism" that's more accurately described as &quo
621.
by scarmig 3y ago
One of the points Yglesias makes is that judges prejudge certain arguments to be wrong. For instance, one judge says > Before anything else, including being a debate judge, I am a Marxist-Leninist-Maoist... I cannot check the revolutiona
622.
by scarmig 3y ago
For the SQUID? Now that brings back even more memories. We got ours from the dining halls.
623.
by scarmig 3y ago
Cold fusion also replicated across multiple labs, before they all retracted shortly after.
624.
by scarmig 3y ago
Skepticism is warranted, but apparently there's infighting in the group (only 3 people can be recipients of a Nobel Prize) and one jumped the gun to get his name out there. And also apparently fear of research espionage from the PRC (n
625.
by scarmig 3y ago
In undergrad, I spent countless hours with a mortar and pestle, sintering, and annealing to research a particular superconductor, never getting much sleep because I had to wake up every couple hours to make sure nothing had gone awry... It
626.
by scarmig 3y ago
If it's confirmed, people will be investigating improving the process for manufacturing LK-99 almost immediately and have some success, as well as looking into similar materials with different doping etc. It's likely that there wo
627.
by scarmig 3y ago
I love the colorful play-by-play. It could almost be a kdrama. It's also kind of crazy that one of the authors did over 1000 experiments until he found LK-99, regardless of whether it checks out. Talk about a grind mindset.
628.
by scarmig 3y ago
I believe they're referring to this comment thread I started: https://news.ycombinator.com/item?id=36881808&p=2#36884542
629.
by scarmig 3y ago
That's a thermodynamic limit, but we're not even close to hitting that yet. RTP superconductors still aren't going to magically make computers emit zero heat, though; there are other sources besides resistive losses. I was un
630.
by scarmig 3y ago
Nice find.

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