Obviously reproducibility is the main thing The point here is what they are trying to reproduce, everyone seem focused to levitation, but seem tha no researcher has yet used a 10 euro multi-meter to measure the resistence Would be a great discovery for every industrial sector. Everything is nowadays, i think it's a byproduct of political bipolarism exported by the USA, which in turn is a byproduct of protestant culture. It's a way of thinking that everything is wrong or right, conservative or progressive, good or bad w/o anything in between. But the world is analogue. A car way more efficient (even taking in account the whole chain), a car that potentially can last forever, a car that moves the nasty pollution from inside the cities to open counties, a car that even if using energy generated by fossil fuel is generated by super efficient power plants that burns fuel externally and that pollute way less than the sum of the suppressed ICE cars. There is literally no question about that. What we should discuss is, to make the battery replaceable, to force the companies to build recycling plants for the exhausted batteries and so on.
There are several things to consider. When you are involved in that research you usually produce tiny amounts of samples and test them. The levitation thingy usually works with tiny amounts of samples. If you can observe it, you have to prove if it comes from the Meißner effect or from diamagnetism which also can show up levitation (diamagnetic levitation). If there is no Meißner effect (signature) you can ditch the sample. It isn't superconductive. To measure resistance properly, you actually need that much of a sample to form a tiny wire. Otherwise you are faced with issues: It shows up zero resistance, but still could be something like 0.000000000001 OR It shows up some resistance, but has in fact zero. The measurement device always has an own resistance and the contacts to the sample have as well.
Well, no. This thing levitates but is not a superconductor. (I think you can buy it in any educative games shop) Yes and no. While the "homebrew" attempts seem all using a tiny sample, the one from the original researcher looks to me as something the size of a 20€c coin, not exactly my definition of tiny Is not complicate as it seems. Those funky materials usually aren't good conductors like silver/copper/aluminium those are usually semiconductors or even insulators that below a temperature threshold become suddenly perfect conductors. Usually that threshold is a very low temperature, but assume that in our case that temperature is 50 degree, so at 20/25 degrees (of the normal room environment) should be pretty straightforward to check their resistance. I mean If you read 20/100/10000 Ohm. It's not a superconductor (at least at room temperature) If you read 0.0001 or 0.000001 or even 0.01 Ohm, likely it's a superconductor. No need to be super precise. The world is analogue, but not at quantum level physics. Obviously it can be something that works at -20 / -80 degrees, and still would be a revolutionary discover, being those themperatures very high, relatively speaking, and easy to obtain (see overklockers) That's not rocket science either, you can use, for example some silver paint easily available in any auto parts or electronic component store, I bet is not hard to find in the shelf of any scientific university laboratory.
I quote myself just because this fresh/sad news https://www.tomshardware.com/news/c...of-chipmaking-materials-gallium-and-germanium Masochism/stupidity of mankind is, as usual, unlimited.
One more thing that I forgot. Look at any video of a static levitating superconductor, you can turn it in any direction and it will stick there, it keeps the orientation... It's a very peculiar effect, possibly more impressive than the levitation itself. First random video Here, in the video posted by @gorski , the (partial) levitation of the thing looks very close to the video of pyrolitic graphite I posted earlier, it bounces like a pudding. For me, it's already a broken dream.
I have to quote myself again https://www.tomshardware.com/news/s...through-confirms-zero-resistance-with-a-catch The thing is superconductive at 110K (-163 º C). I was even too optimist.
Who knows what the Russians are doing or the Chinese or... You know, if it isn't published in English ==> it doesn't exist... Russians are particularly good at conceiving and making new materials, which is why their space programme was so advanced, for instance... The Chinese are making huge strides, simply by investing so much in education, scientists, researchers and I bet - the military... We've seen their MAGLEV trains perform... Let's watch this space...
Lol, the same I have posted. So your answer is: Well, yes....... Only yes. I am talking about professional research for superconductivity. Those 20€ coins are pictures from known superconductors. Also if you should see fog moving downwards you can be sure it's a very low temperature there. Nobody coming from professional research would go for such as big size. The reason is very simple. You have to be sure you have exactly the same homogeneity within the structure. Finally you have to scientifically describe the structure of the crystal grid and reason the mechanism for superconductivity! The bigger the body of the sample the more chance of inhomogeneity. Guess why is it that hard to reproduce the absolute same crystal grid? Some Chinese obviously could...and there you can see real samples....microscopic tiny samples. Samples as big as a coin with regards to LK-99 are fake. Sure it is. I bet it'll take months until science can say if LK-99 is superconductive or not. Sorry that is completely wrong! You have to prove the Meißner effect. We are speaking about NO resistance at all. There is no 'likely'. Either there is resistance left or not. You have to be super precise even because we are on quantum level! Where else if not there? Look, superconductivity is a special condition of an absolute! This condition collapses if circumstances are not met anymore! To measure zero Ohms is a scientific challenge every time.
Quantum level? So there is no resistance and then there is... like in England with the current live de-skinning of the masses...
Yes there is a transition temperature. AFAIK superconductivity is not fully understood. Although it is a macroscopic phenomenon, it is a very special 'conformation' of particles on quantum level (all Cooper-pairs are part of the same quantum-mechanical condition, they are dependent on each others) that guarantees superconductivity. Imagine a house of cards which would be precondition of a certain phenomenon, if it collapses the phenomenon disappears suddenly. I mean. Imagine this condition. There is absolutely NO resistance to the current to pass through the superconductor! Nothing on its way through so to say. There is many more on quantum level as people think. Every CPU operates on quantum level. (Not to confuse with Qbits, though) Also many people do not know how actually electric current 'flows'...and what are 'hurdles'..for instance many people think that the velocity of the electrons within a conductor is near the speed of light. In fact they move really slow. In copper around 1500 km /s. (The speed of light is 300,000 km /s) My boss is a pro for superconductivity...had not the chance yet to ask him about LK-99.
So, no. Pyrlolyitic graphite is is not a superconductor, levitation itself is not a sure evidence of superconductivity. That's the point. No again. I'm talking by the video shared by the original group, not about random videos. The on that @gorski posted later, and that was initially shared in twitter videos. And still looks the size of a 20 cent coin. Obviously the whole thing will trigger a new wave of experiments, that will last months, exactly like happened with the cold fusion thing, but still the original researchers are professional researcher from a university, unless it's everything made up, which I don't think. And still they used a big sample, relatively speaking. And no matter the amount of research will be involved, If I'm a researcher (looking for funds, like any researcher) and I have a tiny bit of confirmation of zero resistance I advertise it. They didn't just because they haven't. Your second sentence tells exactly why I'm absolutely right It's a binary thing. There is some resistance or there is zero resistance. It's a binary thing, like in IT/Digital electronics. The whole digital electrons works exactly because a binary 0 is usually a zero volt level. A 0 .1 volt level is still a binary zero. Here it's exactly the same. If you have a superconductor, and your tester say 0.001 ohm (because a poor contact with terminals, because the multi-meter is not fully calibrated or whatever, you can say safely that the resistance is zero. The whole thing is completely different from a normal metal conductor where the resistance changes (more or less) linearly with temperatures, and an exact resistance reading matters.
This is funny. Yes, I had posted the same! Maybe re-read what I have posted. We are in agreement here. Levitation = phenomenon that can come from superconductivity OR from other effects!!! BUT Meißner effect = superconductivity= levitation. I think we are mostly in agreement... But.. There is no coin based size for LK-99, those are fake. Upscaling those to such a huge size requires a lot of know how, which is surely not here (yet)... And no. There is no resistance measurement for proving superconductivity. There are too many issues. You always find it by proving the Meißner effect! This video looks legit:
Yes, looks like we are. That's possible, obviously This video is from is the same linked in my first message and is from Huazhong University of Science and Technology. It was the first replication attempt. Obviously with so small size is hard to measure the resistance
Even better. But I am still skeptical about those coin sized samples. One indication that those are fake would be clearly fog moving around! This would indicate very low temperatures. When 'baking' a coin sized sample you might have superconductivity only at certain areas within the coin. The bigger the sample the more the chance that your baking conditions are inconsistent. Either way..this is exciting and I am curious about the future of LK-99
That's what one of the guys in one of those videos stated: the field works when it finds a way/hole into the material to levitate... Didn't he?
Yes. But how to find it? And the original video is not convincing. The coin sized sample is still attached to the magnet, it isn't freely floating. There is no fog visible which at least indicates there is no low temperature as you can see at known superconductors. But it looks more like diamagnetic levitation, not the Meißner effect. If it's due to inconsistency within the material, then there is an issue at synthesizing the material. But as being said: The researchers even do circumvent such issues by synthesizing tiny amounts of samples first before they try to upscale. Also what's odd is: LK-99 stands for the year 1999, the first time they have synthesized it. Why now publishing it? Also their scale at the resistance diagram where it crosses 0 is by far too crude... On the other hand that Chinese video of that tiny microscopic bit looks like the Meißner effect, though. For now I wouldn't be that optimistic. If it should be superconductive, there will be an issue at synthesizing it in larger quantities with some consistency.
That's what I'm saying. For me is a definitive evidence that the sample in that video (assuming it's true) is not a superconductor, at least not at room temperature. The behavior is macroscopically different. Unless they have a card to play in their sleeves there isn't any revolution around the corner.
Yes. The Physicists who are familiar with that matter are skeptical, too. Only a few others are still positive. I did some more research yesterday evening and my 'hope' dropped much. All the more some recognized the Chinese video using that microscopic bit had used a very low temperature. If that should be true, they obviously tried to manipulate the results. And I recognized the correct physical expression for 'resistance' is renitency. That's odd. The German language which is usually much more differentiated uses the same expression. Widerstand.
In the best scenario they were affected by so called "confirmation bias", but more likely they are just looking for fame and funding. In Italian "renitenza" is the crime commited by who tried to skip the (once mandatory) military service, a weaker crime than desertion, but googling a bit I see is (rarely) used also as a synonym of riluttanza/reluctance, which is something different from resistance, in German is "Magnetischer Widerstand".