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Ferromagnetic half levitation of LK-99-like synthetic samples

arxiv.org

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Re: Ferromagnetic half levitation of LK-99-like synthetic samples

#161

Post by xyproto »

tw1984 wrote: post #151
ironborn123 wrote: post #132

Earlier quoted context omitted.

There are 2 things in favor of the Korean team - Hyun-Tak Kim is unlikely to ruin his career and legacy for something careless and frivolous. But stranger things have happened, so lets assign a 10% probability to give some benefit of doubt to the team. - The various DFT papers show interesting flat band structures. But DFT is an approximation and also they do not take into account electron electron correlations. So l…

> Hyun-Tak Kim is unlikely to ruin his career and legacy for something careless and frivolous. you came with presumption that this man knows & understands the subject matter. that is a very bold assumption given the mounting evidence against such brief. > so lets assign a 10% probability why 10%? not 0.01%? because of his "prof." title or previous publications? Surely that won't change the course of nature I thought?…

> You seem to have some really wired brief here, get some help I say.

I googled "wired brief" and this is what I found:

https://www.ebay.ca/itm/303994118271

Re: Ferromagnetic half levitation of LK-99-like synthetic samples

#162

Post by smcl »

tw1984 wrote: post #151
ironborn123 wrote: post #132

Earlier quoted context omitted.

There are 2 things in favor of the Korean team - Hyun-Tak Kim is unlikely to ruin his career and legacy for something careless and frivolous. But stranger things have happened, so lets assign a 10% probability to give some benefit of doubt to the team. - The various DFT papers show interesting flat band structures. But DFT is an approximation and also they do not take into account electron electron correlations. So l…

> Hyun-Tak Kim is unlikely to ruin his career and legacy for something careless and frivolous. you came with presumption that this man knows & understands the subject matter. that is a very bold assumption given the mounting evidence against such brief. > so lets assign a 10% probability why 10%? not 0.01%? because of his "prof." title or previous publications? Surely that won't change the course of nature I thought?…

I've seen this on here before. Guys convincing themselves that they're being rational and you're being emotional - because they put little numbers besides their feelings and perform some calculations to produce a percentage that "proves" their theory about Antivax stuff, Putin/Ukraine or whatever is credible.

Re: Ferromagnetic half levitation of LK-99-like synthetic samples

#163

Post by pangolin_lawyer »

herewulf wrote: post #136
InvisibleUp wrote: post #134

Earlier quoted context omitted.

It's just a read-only Twitter mirror.

It "just" makes Twitter readable to the Internet at large.

Also, you can host your own private nitter instance and follow accounts using rss.

https://github.com/zedeus/nitter

Re: Ferromagnetic half levitation of LK-99-like synthetic samples

#164

Post by jldugger »

mkagenius wrote: post #157
ThePhysicist wrote: post #142

Earlier quoted context omitted.

Maybe a cautionary reminder to not listen to random influencers on Twitter. The expert community was really silent and reserved from the beginning as they've seen such wonder materials many times. Having worked in that field for many years I'm personally skeptical that there ever will be an ambient-pressure, room-temperature superconductor. The band structure and interactions that need to be present in the material a…

Yes, I only listen to people with handle like "ThePhysicist" or "theMaterialPhyisicist" at hackernews.

I think the point is you can probably ignore everyone who isn't giving a Nobel acceptance speech.

Re: Ferromagnetic half levitation of LK-99-like synthetic samples

#165

Post by MayeulC »

xcdzvyn wrote: post #158
herewulf wrote: post #136

Earlier quoted context omitted.

It "just" makes Twitter readable to the Internet at large.

"At large" is a strong term given the average person (even the average Twitter reader) doesn't know what it is ;)

I think you misunderstood. Twitter is almost unusable without an account, and the website is very slow. Nitter makes it usable for the majority of us with no twitter accounts, and/or relatively slow devices.

Re: Ferromagnetic half levitation of LK-99-like synthetic samples

#166

Post by rishav_sharan »

clmay wrote: post #103
rishav_sharan wrote: post #99

Naive question, and I hope someone more knowledgeable than me can enlighten me here; Why are we even testing for superconductivity with levitation, instead of just checking for current loss/heat loss while conducting?

This question has been asked with near identical or very similar wording in almost every LK-99 submission I've seen over the last week or so... Is there something botnet-y happening? I find it hard to believe anyone reading similar threads could have missed the numerous answers to this and similarly-formed questions that have been offered lately.

Maybe it is the most natural question which comes to a lay person like me when it comes to superconducting. Not everyone can be as knowledgeable, or in the loop as you are.

And I assure you that I am no bot. I acquire sustenance, go into low energy states and have a lifetime warranty like all fellow meatbags.

Re: Ferromagnetic half levitation of LK-99-like synthetic samples

#168

Post by j7ake »

carabiner wrote: post #148
ironborn123 wrote: post #132

Earlier quoted context omitted.

There are 2 things in favor of the Korean team - Hyun-Tak Kim is unlikely to ruin his career and legacy for something careless and frivolous. But stranger things have happened, so lets assign a 10% probability to give some benefit of doubt to the team. - The various DFT papers show interesting flat band structures. But DFT is an approximation and also they do not take into account electron electron correlations. So l…

I too like to assign probabilities to my vibes. Much more legitimate.

It’s the Bayesian way.

Re: Ferromagnetic half levitation of LK-99-like synthetic samples

#169

Post by Smoosh »

NovaDudely wrote: post #37
VHRanger wrote: post #4

After reading the r/physics thread on LK-99 [1] I've cooled significantly on the matter. Basically: people who work in SC think the initial science seems very sloppy and the replication attempts don't come close to what you need to demonstrate a RT SC [1] https://www.reddit.com/r/Physics/comments/15i3h9d/lk99_megat...

I have been very cautious on any analysis on LK99 - especially my own. I have mentioned to many people that any potential application of this stuff comes with an 'if it is real'. That IF is doing a lot of heavy lifting and it has to be emphasized. I want this to be a thing, but it doesn't matter how much you want something to be true, it actually HAS to be true. A beautiful elegant idea can be crushed by a single ugl…

As youtuber John Cadogan says "facts don't care about your feelings".

Re: Ferromagnetic half levitation of LK-99-like synthetic samples

#170

Post by Double_a_92 »

culebron21 wrote: post #159
protastus wrote: post #26

Earlier quoted context omitted.

The SNR of this saga is very low. A speck of something floating under a magnetic field on a blurry video is not proof of room temperature superconductivity. We've seen memes, jokes, shitposting, bravado, Soviet fan fiction, play-by-play updates from non-SMEs cooking stuff under improvised conditions. No actual resistance measurement of LK-99 with a 4 point probe. If this is real, then discoverers found this in 1999,…

Yes, that's what caught my attention too: no actual conductivity measurement, but only magnetic levitation.

Because the levitation is a much better proof. It can only levitate if the resistance is really exactly 0.

While measuring it somehow always adds errors, because the probes themselves have resistance. And then you can't be sure if it's 0 or just really low.

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