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Observation of zero resistance above 100 K in Pb₁₀₋ₓCuₓ(PO₄)₆O

arxiv.org

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Re: Observation of zero resistance above 100 K in Pb₁₀₋ₓCuₓ(PO₄)₆O

#361

Post by hamilyon2 »

crote wrote: post #245
hamilyon2 wrote: post #238

Why is western mass media silent? They always pick up emerging stories like that, but not in this case for some reason

Western media isn't silent. It has been showing up in the science section of mainstream media for a few days now, with a healthy dose of skepticism around it. It's in the New York Post, on CNET, on CNBC, the Washington Post, Wired, New Scientist, Popular Mechanics, and plenty more. Just because CNN isn't covering it 24/7 doesn't mean the western mass media is "silent".

Good to know. So it means that the particular subset of media I am paying attention is silent. Thank you for the correction

Re: Observation of zero resistance above 100 K in Pb₁₀₋ₓCuₓ(PO₄)₆O

#362

Post by yreg »

kolinko wrote: post #239
febusravenga wrote: post #227

I see lead (Pb...something) as main ingredient, isn't it banned in most industries because how toxic it is and how hard it's to handle in industrial scale? isn't that a problem for potential mass applications? (lots of comments about this discovery call this revolution that will change everything around us and that somehow implies mass production I guess)

A high chance that lead can be replaced with other metal, from what I heard. Also, it’s not extremely toxic - romans ate from lead dishes and didn’t even notice the toxicity. You don’t want to consume it, and you don’t want to breathe it, but it’s not as bad as say, asbestos. If you have an ICE car, it probably has a lead-acid battery, and the only thing that prevents us from using lead in grid storage is their short…

Tesla has a lead-acid 12V battery as well :)

Re: Observation of zero resistance above 100 K in Pb₁₀₋ₓCuₓ(PO₄)₆O

#363

Post by yreg »

drtgh wrote: post #219
declan_roberts wrote: post #139

Earlier quoted context omitted.

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...

From the same author https://doi.org/10.2514/6.2019-0869 , 2019 Salvatore Cezar Pais > 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, depen…

This person has an absurd patent track record https://en.wikipedia.org/wiki/Salvatore_Pais

Re: Observation of zero resistance above 100 K in Pb₁₀₋ₓCuₓ(PO₄)₆O

#364

Post by junon »

greenthrow wrote: post #333
_jal wrote: post #331

Earlier quoted context omitted.

Just to underline this, after years of plague, war and uncertainty, I think this is a great, positive thing, whatever happens. I'm annoyed with someone I was talking to about this, who either can't or won't stop ranting about past high-profile failures. Yes, we all know. Old folks like me remember the cold fusion scam first hand. Your knowing cynicism displays deep scientific wisdom. Happy? Great, now let's watch the…

It's one thing to engage suspension of disbelief when watching a movie. It's another to engage it when discussing actual scientific papers.

No, it's not. Most people engaging in scientific papers are not themselves scientists in the field. Further, their enthusiasm doesn't change reality. LK-99 is or is not a superconductor. People getting overly excited doesn't change that. Lighten up.

Re: Observation of zero resistance above 100 K in Pb₁₀₋ₓCuₓ(PO₄)₆O

#365

Post by zackees »

_jal wrote: post #331
junon wrote: post #296

Earlier quoted context omitted.

This. The idea that science can't also be fun seems to be the mindset of a lot of people criticizing others for participating more as eager spectators. Nothing wrong with that. Let people enjoy things. If LK-99 turns out to be nothing then we got some entertainment out of it and a lot of people learned about superconductors (and science in general) in the process. How's that not a win in and of itself?

Just to underline this, after years of plague, war and uncertainty, I think this is a great, positive thing, whatever happens. I'm annoyed with someone I was talking to about this, who either can't or won't stop ranting about past high-profile failures. Yes, we all know. Old folks like me remember the cold fusion scam first hand. Your knowing cynicism displays deep scientific wisdom. Happy? Great, now let's watch the…

Cold fusion was replicated by a few labs but that wasn’t good enough for the media and they killed it. For background see 60 minutes episode “Cold Fusion is Hot again” where they interview and admit Pons Fleischmann was right.

The difference now is that China is a super power and doesn’t have to kiss the ring of the US hegemon.

As an example of replication see

https://www.sciencedirect.com/science/article/pii/S036031992...

There are many paper like this.

The “cold fusion is a hoax” was in itself, a hoax.

Re: Observation of zero resistance above 100 K in Pb₁₀₋ₓCuₓ(PO₄)₆O

#366

Post by TheRealPomax »

jcranmer wrote: post #74
tomohelix wrote: post #30

Summary of events so far: The claim: Room temp (~300K) superconductor exists and we got it! The replication attempts: The production method is so poorly documented only a fraction of the samples being made shows any interesting properties. And among those interesting ones, results varies. Very few, if any, attempt actually completely shows the entire spectrum of properties and behaviors of a true superconductor at ro…

> Worst case scenario, we got another class of high temp (warmer than liquid nitrogen but cold enough that applications are limited) superconductor but nothing revolutionary since at this point, it is pretty conclusive that there is something interesting with LK-99. I don't think that's the worst case scenario. The worst case scenario is that there is actually nothing interesting with LK-99, and everything we've seen…

I'd go one step further. The worst case is they made up data enough to seem plausible, knowing full well replication is impossible, but their institution wanted their name in a major publication so they were told to make shit up and get published.

Re: Observation of zero resistance above 100 K in Pb₁₀₋ₓCuₓ(PO₄)₆O

#367

Post by robotresearcher »

patrec wrote: post #196
robotresearcher wrote: post #81

Earlier quoted context omitted.

Link says 90 MA per cm^2, or 30,000X more than copper. Gulp!

I think you are missing a zero.

You are right!

300,000X more than copper.

Typo converting from brain to screen. I should have used exponential notation and the mistake would have been more obvious.

Re: Observation of zero resistance above 100 K in Pb₁₀₋ₓCuₓ(PO₄)₆O

#368

Post by mmusson »

mmusson wrote: post #272
ThrowawayTestr wrote: post #35

Earlier quoted context omitted.

Zero loss diodes seem pretty useful.

How would that work? A diode requires a p-n junction created by doping the substrate. It has low resistance in one direction but ideally infinite resistance in the other direction.

I just saw an article that explains the superconducting diode effect https://phys.org/news/2023-08-ubiquitous-superconductive-dio...

So theres the answer.

Re: Observation of zero resistance above 100 K in Pb₁₀₋ₓCuₓ(PO₄)₆O

#369

Post by bandrami »

adrian_b wrote: post #251
bandrami wrote: post #70

Earlier quoted context omitted.

Most semiconductors have a thermal regime where that happens, it's just a relatively small regime, I thought?

Here the resistance decreases in the opposite direction, so it cannot be explained by changes in the concentration of free carriers, like in semiconductors. In metals, the concentration of free carriers is constant and the resistance decreases towards lower temperatures because the mobility of the free carriers increases, i.e. there is less friction between them and the crystal lattice, because the vibrations of the…

Thanks; I managed to read GP comment backwards somehow.

Re: Observation of zero resistance above 100 K in Pb₁₀₋ₓCuₓ(PO₄)₆O

#370

Post by hcks »

- it’s an easy to make room temperature superconductor!

- ok it’s hard to make but still RTSC!

- ok it’s superconducting at 100K but its a novel class of SC! you are here

- ok it’s not a superconductor but it still has interesting properties!

- ok it doesn’t have singular properties but it could have!

I predict there will still be LK99 truthers in 20 years arguing that this amazing discovery was buried by big copper conspiracy.

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