The two Chinese labs working on replicating LK-99 appear to have found a room-temperature superconductor.
At first blush, here's what's different from last time:
• it's more like "room temperature" than room temperature, the paper says 250K which is -10 F or -23 C. That's still HUGE IF TRUE, because we can get things that cold with liquid nitrogen
• we have actually discovered a superconductor at this temperature before, but it was at high pressure. This paper says it's potentially superconductive AT AMBIENT, NORMAL PRESSURE
• it has *already* replicated, with two separate labs in China confirming the results. Last time the big question was "will it replicate." And the answer this time seems to be "it already has"
At first blush, here's what's different from last time:
• it's more like "room temperature" than room temperature, the paper says 250K which is -10 F or -23 C. That's still HUGE IF TRUE, because we can get things that cold with liquid nitrogen
• we have actually discovered a superconductor at this temperature before, but it was at high pressure. This paper says it's potentially superconductive AT AMBIENT, NORMAL PRESSURE
• it has *already* replicated, with two separate labs in China confirming the results. Last time the big question was "will it replicate." And the answer this time seems to be "it already has"
The chemical difference appears to be that this thing has sulfur where LK-99 did not.
Interestingly, the first floating LK-99 was rumored to have been contaminated with sulfur... That was bad then, but it might have been what turned the researchers onto this new material.
Interestingly, the first floating LK-99 was rumored to have been contaminated with sulfur... That was bad then, but it might have been what turned the researchers onto this new material.
The authors are WAY more cautious in how they're messaging the results this time.
They're saying it "possibly" exhibits the Meissner Effect (THE ROCKS POSSIBLY FLOAT):
可以这样理解: 人类还没有仪器能测到理论严格意义上的迈斯纳, 所以加possible是出于对自然复杂性的敬畏.
(Translation: It can be understood this way: humans do not yet have instruments that can measure Meissner in the strict sense of the theory, so adding "possible" is out of awe of the complexity of nature.)
zhuanlan.zhihu.com/p/675576020
They're saying it "possibly" exhibits the Meissner Effect (THE ROCKS POSSIBLY FLOAT):
可以这样理解: 人类还没有仪器能测到理论严格意义上的迈斯纳, 所以加possible是出于对自然复杂性的敬畏.
(Translation: It can be understood this way: humans do not yet have instruments that can measure Meissner in the strict sense of the theory, so adding "possible" is out of awe of the complexity of nature.)
zhuanlan.zhihu.com/p/675576020
There is a rumor that a picture of a rock floating completely upside down has been posted by the authors, I'm trying to find it now...
Last time, the samples were contaminated which led to the rocks floating.
This time, the authors are being SUPER careful not to let that happen again — they explicitly discuss what they did to test and make sure there wasn't just iron causing normal diamagnetic behavior here
This time, the authors are being SUPER careful not to let that happen again — they explicitly discuss what they did to test and make sure there wasn't just iron causing normal diamagnetic behavior here
Is anyone needs help decoding the terminology that will be thrown around over the next few days:
Good recap of the work that's been going on while the rest of us moved onto a new Current Thing
https://twitter.com/8teapi/status/1742393292741120074
Okay I have emerged from the Chinese forums discussing this with a second paper, dated Dec 16, 2023.
Seems that a totally different, third set of scientists published potentially exciting results right before the new year:
This also reports a phase transition at 250 K, tested with a totally different techniquebrowse.arxiv.org/html/2312.1039…
Seems that a totally different, third set of scientists published potentially exciting results right before the new year:
This also reports a phase transition at 250 K, tested with a totally different techniquebrowse.arxiv.org/html/2312.1039…
Damnit, just realized my original tweet says "with" not "without" liquid nitrogen...
If this thing is superconductive at -23 C, we can cool it using *a normal ice cream freezer*
If this thing is superconductive at -23 C, we can cool it using *a normal ice cream freezer*
1. Holy shit, they're going to post a video. (!!!)
2. The sample they created appears to have 5/1000 particles that look promising.
Maybe that explains how we don't have a picture yet? Teeny tiny floating rocks, aka it's just floating sand right now?
2. The sample they created appears to have 5/1000 particles that look promising.
Maybe that explains how we don't have a picture yet? Teeny tiny floating rocks, aka it's just floating sand right now?
The South China Tech researcher explains the paper a little deeper (translated):
What you see on the page is almost the same as the picture presented in the article.
The signal is indeed relatively poor, an order of magnitude smaller than that of the Koreans, and the superconducting volume fraction is about five thousandths. The sample size was small to begin with, and a portion of it was allocated for EPR. Therefore, a smooth line is added to the graph, which is automatically generated based on the data points using Origin, in order to better display the results.
Of course, it doesn’t matter if you don’t add it. The core data is the diamond chart, which everyone can understand at a glance. We have specially encrypted the measurement points below 500e to ensure that the interference of measurement errors can be eliminated. The sharp front near the zero field is very significant, consistent results are measured at different temperatures, and the possibility of experimental error is very small.
This diamond curve is the first one known so far, and no Korean has ever seen it. Although there are many noise points, the most valuable thing is authenticity. Don't worry, everyone,
after you have the first one, it is only a matter of time before you make a more regular and beautiful one.
This time may take a long time. Mr. Wu's liver is no longer moving and he needs to take a rest in a short period of time. The pictures are all cut out from the Word he sent before he left.
The degree of completion is not high, so you can just make do with it. It will be changed to look better when it is officially submitted.
Fortunately, we have other lines, and there are things to look forward to besides Meisner. It has been arranged step by step for a long time.
I am particularly proud that the predicted glassy state has been further confirmed.
When designing the test plan at that time, a specially designed link was to scan the MH loop at different temperatures during the zero-field cooling process.
If it is glassy, the sample should remember this operation and react during subsequent heating. Indeed, the last temperature point of our sweep line was 100K.
Sure enough, when the temperature was raised to measure ZFC, the 100K point jumped up very obviously, reflecting that the sample remembered the operation during the cooling process.
Such an amazing glass state memory effect is enough to explain many phenomena. For example, why does our diamond curve seem unsymmetrical? Why is 25Oe
negative when measuring MT, but positive when sweeping back the line (it was negative during the initial measurement)? Because the magnetic field is strongly pinned in the sample. If the vortex is passed, thermal fluctuations cannot allow it to relax quickly, which will cause these strange phenomena to occur.
So before the test, I repeatedly warned not to add a magnetic field to find the position. This is their common habit. As soon as the magnetic field is increased, the magnetic flux structure in the entire sample will be chaotic, which will interfere with the accuracy of the measurement results.
What you see on the page is almost the same as the picture presented in the article.
The signal is indeed relatively poor, an order of magnitude smaller than that of the Koreans, and the superconducting volume fraction is about five thousandths. The sample size was small to begin with, and a portion of it was allocated for EPR. Therefore, a smooth line is added to the graph, which is automatically generated based on the data points using Origin, in order to better display the results.
Of course, it doesn’t matter if you don’t add it. The core data is the diamond chart, which everyone can understand at a glance. We have specially encrypted the measurement points below 500e to ensure that the interference of measurement errors can be eliminated. The sharp front near the zero field is very significant, consistent results are measured at different temperatures, and the possibility of experimental error is very small.
This diamond curve is the first one known so far, and no Korean has ever seen it. Although there are many noise points, the most valuable thing is authenticity. Don't worry, everyone,
after you have the first one, it is only a matter of time before you make a more regular and beautiful one.
This time may take a long time. Mr. Wu's liver is no longer moving and he needs to take a rest in a short period of time. The pictures are all cut out from the Word he sent before he left.
The degree of completion is not high, so you can just make do with it. It will be changed to look better when it is officially submitted.
Fortunately, we have other lines, and there are things to look forward to besides Meisner. It has been arranged step by step for a long time.
I am particularly proud that the predicted glassy state has been further confirmed.
When designing the test plan at that time, a specially designed link was to scan the MH loop at different temperatures during the zero-field cooling process.
If it is glassy, the sample should remember this operation and react during subsequent heating. Indeed, the last temperature point of our sweep line was 100K.
Sure enough, when the temperature was raised to measure ZFC, the 100K point jumped up very obviously, reflecting that the sample remembered the operation during the cooling process.
Such an amazing glass state memory effect is enough to explain many phenomena. For example, why does our diamond curve seem unsymmetrical? Why is 25Oe
negative when measuring MT, but positive when sweeping back the line (it was negative during the initial measurement)? Because the magnetic field is strongly pinned in the sample. If the vortex is passed, thermal fluctuations cannot allow it to relax quickly, which will cause these strange phenomena to occur.
So before the test, I repeatedly warned not to add a magnetic field to find the position. This is their common habit. As soon as the magnetic field is increased, the magnetic flux structure in the entire sample will be chaotic, which will interfere with the accuracy of the measurement results.
We're gonna have to come up with a better name lol
"We synthesized materials... called PCPOSOS, which exhibit superconducting behavior at room temperature and atmospheric pressure."
"We synthesized materials... called PCPOSOS, which exhibit superconducting behavior at room temperature and atmospheric pressure."
🥲
New rumor that a third Chinese university is going to publish a replication attempt in Nature
"Suddenly, Lao Dao made a big jump, and the preprint will be submitted in two days. The journal will definitely select it this week. The journal will select N directly. If N is not
acceptable, it will be S. I won’t post the screenshot, someone will prove it for me. In the new year, heroes from all walks of life are about to appear.
Brother, didn’t Lao Dao’s original words suggest that the journal should be submitted to the journal in the past two days? The preprint will be submitted to the journal after the patent is released, which will take some time. Why did you end up submitting preprints in the past two days?
But what Lao Dao means is that he hasn’t directed it yet."
"Suddenly, Lao Dao made a big jump, and the preprint will be submitted in two days. The journal will definitely select it this week. The journal will select N directly. If N is not
acceptable, it will be S. I won’t post the screenshot, someone will prove it for me. In the new year, heroes from all walks of life are about to appear.
Brother, didn’t Lao Dao’s original words suggest that the journal should be submitted to the journal in the past two days? The preprint will be submitted to the journal after the patent is released, which will take some time. Why did you end up submitting preprints in the past two days?
But what Lao Dao means is that he hasn’t directed it yet."
Awesome writeup from @Andercot here:
https://x.com/Andercot/status/1742650506559005158?s=20
When is the replication attempt coming, @andrewmccalip??
https://x.com/andrewmccalip/status/1742573336985845771?s=20
@andrewmccalip That's it for day one, folks!
New news breaking here:
New news breaking here:
https://twitter.com/pronounced_kyle/status/1742725029450916111
• • •
Missing some Tweet in this thread? You can try to
force a refresh
