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Room-Temperature Ambient-Pressure Superconductor LK-99 preprint revision 2

arxiv.org

201–210 of 316 posts

Re: Room-Temperature Ambient-Pressure Superconductor LK-99 preprint revision 2

#201

Earlier quoted context omitted.

My iPhone can take stunning videos. This is not 2010 anymore

Congratulations on owning an iPhone! (I do too, they’re great.) But I want to emphasize that the quality of the phone camera was not the point of that story.

Then what was the point? If I saw a unicorn and took out my phone in a hurry I could get a video of exceptional quality, granted I uploaded it somewhere without too much compression. Seems like you wanted to create a little abstract story ignoring the reality of hardware

Re: Room-Temperature Ambient-Pressure Superconductor LK-99 preprint revision 2

#202
post #20

I have a PhD in material science and worked with superconductors, here are two things that is often misunderstood: 1) it takes a undergrad to make and measure a superconductor but a Nobel laureate to explain it. 2) in theory if you understand the mechanism of something you can improve it. In material science however almost always all you need is a trial and error approach to end up with a good result. Conclusion: the…

> material science however almost always all you need is a trial and error Is it science if you essentially fiddle something until you get a result you are after and then try to fit a theory that would explain the result of the fiddle?

It is if you do it in a way that's reproducible, and if the methods used are based on already-known science. It wouldn't be scientific if there's only one machine in the entire world that can get the desired effect and nobody can figure out why, or if one of the steps involves praying to Cthulhu.

Re: Room-Temperature Ambient-Pressure Superconductor LK-99 preprint revision 2

#203

Preprint by Griffin from Livermore Labs gives a theoretical explanation of LK-99's superconductivity and also explains why labs are having a hard time synthesizing it. There are two Pb sites in the crystal structure that Cu can substitute at, the lower energy one does nothing but it's the higher energy site that creates superconductivity. https://arxiv.org/pdf/2307.16892.pdf "Finally, the calculations presented here…

What does this mean for synthesis? You just have to try a ton of times and get lucky? Is there some way to influence site substitution?

Re: Room-Temperature Ambient-Pressure Superconductor LK-99 preprint revision 2

#204
post #23

https://www.bilibili.com/video/BV14p4y1V7kS/ Latest update: the diamagnetism has been confirmed from a tiny LK-99 replica sample. The Author posted: > Under the guidance of Professor Haixin Chang, postdoctor Hao Wu and PhD student Li Yang from the School of Materials Science and Technology of Huazhong University of Science and Technology successfully for the first time verified the LK-99 crystal that can be magnetica…

Judging by the quality of the video, this LK-99 could just be the best nerd-trawling operation of the decade.

Re: Room-Temperature Ambient-Pressure Superconductor LK-99 preprint revision 2

#205
In this version, in figure 6a and b the new log scale of the IV curve looks quite linear and increasing in the range of 150 to 250 mA. I thought that it should be flat if it was a superconductor (no resistance). Can anyone explain how that behavior still supports it being a superconductor?

Re: Room-Temperature Ambient-Pressure Superconductor LK-99 preprint revision 2

#206
post #63

Earlier quoted context omitted.

Not possible. Theory comes first. Scientists need a theory first to know which experiments to do. Any interesting experimental results are interesting precisely because they do not conform to the existing theories. Edit: here's a decent writeup to show what I mean https://en.wikipedia.org/wiki/Theory-ladenness

The most exciting phrase to hear in science, the one that heralds new discoveries, is not “Eureka!” (I found it!) but “That’s funny …” — Isaac Asimov

“That’s funny…” implies you had a pre existing theory about how it was supposed to work.

Re: Room-Temperature Ambient-Pressure Superconductor LK-99 preprint revision 2

#207
post #191
post #23

https://www.bilibili.com/video/BV14p4y1V7kS/ Latest update: the diamagnetism has been confirmed from a tiny LK-99 replica sample. The Author posted: > Under the guidance of Professor Haixin Chang, postdoctor Hao Wu and PhD student Li Yang from the School of Materials Science and Technology of Huazhong University of Science and Technology successfully for the first time verified the LK-99 crystal that can be magnetica…

How anyone can see anything in the video is beyond me. Just dozens of comments literally flying across the video.

They probably turn off the comments.

Re: Room-Temperature Ambient-Pressure Superconductor LK-99 preprint revision 2

#208
post #175

Earlier quoted context omitted.

Sure, it doesn't spread down to 1901, but the uptick started around 1970s [1]. Anyway, my main rant was about the inefficiency of giving awards to "lone geniuses", at most three, of expecting said "lone wolves" to exist in the first place, and then comes the discussion if the wolves are male or not. Unfortunately it got derailed into talking about pseudoscientific scalars such as IQ and sex binaries. [1] "large scale…

Most Nobel winners get their prizes during their 60s-70s. It means that people who graduated in the 1970s are just starting to get their Nobels. And the trend of aging winners continues as research become more complex and specialized and therefore requires more experience. The time between theory and the practical discovery (Nobel prizes are only for the latter) increase as experiments become more complex too. So muc…

True. That's why we probably need another mechanism for incentivizing high-risk/high-reward/multi-decennial research. Perhaps, even if LK99 is not real, something interesting will mutate out of it: some kind of platform merging arXiv, Twitch, Patreon, making the researchers to be more transparent, more willing to share partial results, failures, and even be rewarded to fail. Some time ago had this "fail database" in mind, where one would upload all the data of the experiments that didn't work. I see there is a "FailCon" [1].

[1] http://thefailcon.com/about.html

Re: Room-Temperature Ambient-Pressure Superconductor LK-99 preprint revision 2

#209

Preprint by Griffin from Livermore Labs gives a theoretical explanation of LK-99's superconductivity and also explains why labs are having a hard time synthesizing it. There are two Pb sites in the crystal structure that Cu can substitute at, the lower energy one does nothing but it's the higher energy site that creates superconductivity. https://arxiv.org/pdf/2307.16892.pdf "Finally, the calculations presented here…

What does this mean for synthesis? You just have to try a ton of times and get lucky? Is there some way to influence site substitution?

I'm guessing the diamagnetic property will make it easy to separate the successful bits from the unsuccessful ones at scale.

Re: Room-Temperature Ambient-Pressure Superconductor LK-99 preprint revision 2

#210

Earlier quoted context omitted.

You are assuming that we have thought of all theories that an experiment can confirm, before conducting the experiment. Considering the large search space, that would be quite surprising.

Can you tell me why a scientist would decide to do a certain experiment without a theory about what to test and why? Why that experiment and not any of infinite others?

We do this much of the time in genetics, genomics, and neuroscience.

New technology; Large set of samples; Quantify x … x mRNAs, proteins, lipids, metabolites; Estimate how units stick together (statistically or literally); Develop a “theory” of what units and groups of units interact to account for and predict higher order phenotypes (risk of neurodegeneration; lifespan).

Data take precedence. Mini-theories of molecular and cellular causality are assembled with some basic brain power and yes—-a dollop of theory and priors—-on the back of a massive pool of well structured data.

Exploratory biology of this type is/was insulted using the terms “fishing” or “mere description” but with current high throughput and high content technologies should be considered research “trawling” and factory-level science; not a cottage industry of small labs. This new style of science can be highly effective in biology and in astronomy as we are learning from Webb.

But it bugs the hell out of some classically trained reductionists who demand that clear hypotheses should drive science forward.

Much of the progress in modern biology falls into this alternative almost hypothesis-free style. I would say “story-free” style of science. Too damn many story-tellers.

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