211–220 of 389 posts
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As for crypto, tgere is nothing to believe in - it’s doing well after 14 years.
You mean cryptography? Yeah, thanks to let's encrypt we are now reaching widespread adoption of TLS. You barely see any http websites anymore thanks to that.
I don’t understand the physics, but it feels like a truly zero resistance conductor would violate some law of thermodynamics or something. Is a superconductor truly zero impedence or just very very very low? Because I’m seeing a lot of these graphs with something like: “0.00001ohm” as the y-axis floor.
So how is this possible? The explanation is acutally reasonably easy, but requires the strangeness of quantum dynamics. One basic principle of quantum dynamics is, that at least most things are quantisized. Especially energy of a state comes in discrete amounts. That is the reason we have orbitals of electrons in atoms. They can only take very specific values, which creates these separate orbitals. There is no in between state, they have always to absorb or emit exactly the amount of energy which is the difference between orbitals when moving between them. Which is a very easy effect to literally see: take glowing phosphors as you find them on your watch etc. These are transitions bound to a specific photon energy. With red light, you cannot "charge" them, as red photons have to little energy, and you can only absorb single photons. Any green or blue light would work though. And whatever light you used to "charge" them, they always glow in the precise same color, coming from their destinct energy state.
The resistance an electron encounters while moving through a conductor is also quantisized. In superconductors we have a situation like trying to charge a watch dial with red light: the amounts of energy an electron could release cannot be absorbed by the material. And an interaction would require this. The consequence is: no interaction, no resistance.
The situation is like trying to buy a $1 bottle of water with a $100 bill. That could turn out to be impossible, because no one is willing to give you back $99, and you can of course not pay $100 for the bottle. So even when having the money, you can't buy the bottle.
This is, in a very naive way, the principle how superconductivity and superfluidity work. The trick now is to prepare the conditions which allow for superconductivity. One way is to make things increadibly cold. All metals become superconductive, if the temperature is close enough to 0. But that is with single digit degrees or below, even fractions of a Kelvin. Konsequently it was a huge sensation when the first complex substance was presented which showed the effect at larger temperatures. Since then the hunt is up to find better substances.
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https://nitter.net/condensed_the/status/1686895266329174016 claims a linear representation of the same data. Still no convincing discontinuity visible.
Makes the dip around 250K even more visible.
Would semi-conductor like properties result in something like this - thermal noise pushing electrons into the band gap?
Can someone point me to a list of exciting applications of room temperature superconductors? Trying to understand why such excitement about this!
ELI5, if these folks confirmed zero resistance at room temp and atmospheric pressure, isn't that confirmation of the original paper? Edit: I read 100 K as 100°c. Mea culpa.
100 degrees kelvin is about 338 degrees Fahrenheit below room temperature.
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Personally, I think we are past the point of this being nothing. There have been multiple confirmations of at least something unexplained going on. Maybe all of them are wrong but honestly, that is more of an extraordinary claim than saying this is something interesting, just not a full on room temp superconductor.
I understand why a lot of people think this, but I don't think we can say that with confidence yet. Cold fusion "replicated successfully" multiple times in the 80s too.
Cold fusion always was dependent on new physics to be discovered
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You mean cryptography? Yeah, thanks to let's encrypt we are now reaching widespread adoption of TLS. You barely see any http websites anymore thanks to that.
You know perfectly well that's not what they meant.
It’s real, it works, the Navy has a linked patent from 2017. The UFOs are a PSYOP.
The Navy does have a patent for a “lead zirconate titanate” super conductor which does sound awfully similar to what’s described in LK-99. https://phys.org/news/2019-02-navy-patent-room-temperature-s...
> It is important for the PZT coating to undergo a polarizing (poling) treatment prior to RTSC enablement, so that optimal domain alignment is obtained within the ceramic coating, by subjecting the coating to a strong dc current electric field, slightly below the Curie temperature (approx.200 0C, but possibly as high as 360 0C, depending on PZT ceramic composition). Furthermore, to increase the probability of vibration in one particular direction, as well as to alleviate the brittle nature of the ceramic material, it may be necessary to make the 'metallic' wire coating out of a composite PZT and highly conductive polymer, such as p-Terphenyl [4]. Another option is to sandwich the PZT ceramic in between two layers of aluminum, resulting in a wire design which may be planar rather than cylindrical in nature. This composite coating design would amplify piezoelectrically-induced vibrations and possibly render them unidirectional.
From LK99 rumors:
> At the beginning of 2020, Ji-Hoon Kim continued to do experiments as usual, suddenly he found a huge peak, he repeated the test + looked at his notes. But didn't find any special points. He started looking through the lab videos. He finally realized that the tube of sample came out with cracks on the quartz tube, and he hit his elbow on the table while transferring the sample out to the electronic scale. Introducing oxygen at the right moment + a violent impact would change the structure of the lead apatite crystals being formed.
May be something, may be nothing,
S.C.Pais: "to increase the probability of vibration in one particular direction"
S.C.Pais: "piezoelectrically-induced vibrations [ and possibly render them unidirectional]"
LK99: "oxygen at the right moment + violent impact would change the structure of the lead apatite crystals being formed"
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The reason I don't think this is the case is that they have literally been working on this thing for a quarter of a century. While the people involved are not full on superconductor experts, they are also not super stupid and realize that their claim is a huge one. How could you work on something for years and years and years, make a claim that it is the first room temperature SC and be _totally_ wrong about it. Even…
Can you really be working with a material for a quarter of a century AND not know how to make the material?
At least for chemistry, it is often a completely different paper that introduces an efficient way for actually mass-producing the given chemical. The first one is more like a proof of concept throwaway code, if we want an analogy.