I was wondering if the breakthroughs made by CFS to make efficient large fusion magnets for SPARC could also help stellerators, or if there is an inherent issue with stellerators that makes high B less useful for them
I just wanted to highlight this paper because it's so interesting that even after more than 25 years we are still discovering new elementary properties of the high-temperature superconductors.
So LaSrCuO is one of the best-known cuprate superconductors with an optimal critical temperature of 38K. Its parent compound La2CuO4 is one of the best known antiferromagnetic Mott insulators, and not particularly difficult to fabricate.
Yet only now people find out that its thermal Hall conductivity (thermal transport in the transverse direction when the sample is under a longitudinal thermal gradient and a perpendicular magnetic field) is "gigantic". This experiment is similarly not particularly difficult (correct me if I'm wrong), it's just that people haven't looked.
The authors claim that both magnons and phonons cannot be responsible for the effect, so there is something new and interesting going on.
This is an automatic summary, original reduced by 73%.
> Under the right conditions-which, right now, include ultra-chilly temperatures-electrical current flows freely through these cuprate superconductors without encountering any "Roadblocks" along the way.
> What makes cuprates so special is that they can achieve this "Magical" state of matter at temperatures a hundred degrees or more above those required by standard superconductors.
> After 10 years of preparing and analyzing more than 2,000 samples of a cuprate with varying amounts of strontium, they found that the number of electron pairs within a given area, or the density of electron pairs, controls the superconducting transition temperature.
> The scientists found that as they added more strontium, the number of electron pairs decreased until absolutely no electrons paired up at all.
> Think of it like this: You're in a dance hall, and at some point, you and the other people-who normally wouldn't be caught arm-in-arm-begin to pair up and move in unison.
> Why do the dancers, or electrons, pair up in the first place? Answering that question is the next step toward unlocking the mechanism of high-temperature superconductivity in the cuprates-a mystery that's been puzzling physicists for more than 30 years.
Summary Source | FAQ | Theory | Feedback | Top five keywords: pair^#1 electron^#2 cuprate^#3 temperature^#4 material^#5
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NOTICE: This thread is for discussing the submission topic. Please do not discuss the concept of the autotldr
... keep reading on reddit ➡This is almost certainly the wrong sub to ask in but I honestly have no idea which one would be correct and I'm dying to know the answer.
I live next door to a steel mill: random noises, earthshaking rumbles, or even explosions are not that uncommon, but last night we had one that I've never seen before and I've got no explanation for.
4:30am. I'm sound asleep facing south with a pillow over my head (Mill is to my north), blinds closed, curtain drawn on a window facing east when I'm awoken by a blinding flash... and by blinding I mean I woke up with the idea that something very bright had just occurred and my eyes hurt and I couldn't see anything at all.
About 3 minutes later my wife is still blinded because she was facing north with nothing over head, but my vision had cleared so I went outside to investigate thinking for sure that I'd see some evidence of what had occurred but see nothing other than a couple of emergency vehicles pulling into the steel mill.
10 minutes later I'm headed back inside, with my back to the mill and it happens again. This time I notice that there's a loud almost electrical sound (think the sound when a very large bug hits a bug zapper and sizzles for a couple of seconds but magnified greatly) that accompanied it that lasted for about 4 seconds. I have no idea how long the flash actually lasted because even with my back turned to it facing the door it was bright enough to momentarily blind me.
So what the hell was it?
Based on the effects I'm guessing whatever it was generated significantly more lumens than a flash bang.
The amount of light it generated seems to limit the possibilities and just intuitively I'd guess something like a cloud of vaporized metal in the air flash-reacting to create a very large bright cloud of plasma but I've got no idea.
Inquiring minds want to know.
