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Semiconducting Transport in LK99 reproduction attempt

arxiv.org

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Re: Semiconducting Transport in LK99 reproduction attempt

#21

Post by danbruc »

bestcoder69 wrote: post #10
danbruc wrote: post #9

Maybe not yet the final nail in the coffin but I would no longer bet much on a successful replication. Which leaves me wondering how we got the initial papers. Does fraud make any sense, how could you possibly benefit from something like this? And if I would think that I might have produced a room temperature superconductor due to experimental errors, I would double and tripple check what I did. Assuming there is tim…

Could be a skill issue on the part of the replicators? The russian anime girl scientist had to make a bunch of modifications (and was cursing the orig authors) before she could make her rocks float.

Of course under the assumption that LK-99 is indeed not what has been claimed, I am not completely ruling out that they just failed to reproduce the material. And while I initially said that the LK-99 paper does at least not look like a crackpot paper [1][2] and still think that was not an unreasonable judgment given my complete lack of expertise in the field, just comparing the presentation in this paper and the original LK-99 paper makes me judge the replicators as more competent. But sure, looks can be deceptive.

[1] https://news.ycombinator.com/item?id=36865636

[2] https://news.ycombinator.com/item?id=36871103

Re: Semiconducting Transport in LK99 reproduction attempt

#22

Post by Azrael3000 »

p-e-w wrote: post #17

> In addition, when a pressed Pb10-xCux(PO4)6O pellet is located on top of a commercial Nd2Fe14B magnet at room temperature, no repulsion could be felt and no magnetic levitation was observed either. So what about the video[1] that shows magnetic levitation occurring? Since the linked article was unable to reproduce this effect, it seems there are two possibilities: 1. The video is fake (which is really, really hard…

Apparently a new paper is supposed to come out from the original authors about the production method [0]. So it really is unclear whether everybody generates the same material.

It's a shame that these papers were published before they were polished by the authors.

[0] https://forums.spacebattles.com/threads/claims-of-room-tempe...

Re: Semiconducting Transport in LK99 reproduction attempt

#23

Post by ecshafer »

p-e-w wrote: post #17

> In addition, when a pressed Pb10-xCux(PO4)6O pellet is located on top of a commercial Nd2Fe14B magnet at room temperature, no repulsion could be felt and no magnetic levitation was observed either. So what about the video[1] that shows magnetic levitation occurring? Since the linked article was unable to reproduce this effect, it seems there are two possibilities: 1. The video is fake (which is really, really hard…

From what I have gathered reading things online, there is some theorizing that given a "perfect" baking process there is something probabilistic going on that means your batch is never 100%.

disclaimer not a physicist or chemist

Re: Semiconducting Transport in LK99 reproduction attempt

#24

Post by PBnFlash »

bestcoder69 wrote: post #10
danbruc wrote: post #9

Maybe not yet the final nail in the coffin but I would no longer bet much on a successful replication. Which leaves me wondering how we got the initial papers. Does fraud make any sense, how could you possibly benefit from something like this? And if I would think that I might have produced a room temperature superconductor due to experimental errors, I would double and tripple check what I did. Assuming there is tim…

Could be a skill issue on the part of the replicators? The russian anime girl scientist had to make a bunch of modifications (and was cursing the orig authors) before she could make her rocks float.

I find that Twitter account to be pretty dubious.

Re: Semiconducting Transport in LK99 reproduction attempt

#25

Post by mrandish »

AYBABTME wrote: post #7

> In addition, when a pressed Pb10-xCux(PO4)6O pellet is located on top of a commercial Nd2Fe14B magnet at room temperature, no repulsion could be felt and no magnetic levitation was observed either. Unless we assume the original paper's authors were straight up lying, it sounds like this paper's author didn't end up with exactly the same material?

The original authors have apparently said they are only able to successfully produce the material in around 1 in 10 attempts and they don't yet know why. Also, replicators have reported that the information in the papers and the patent aren't entirely clear on some potentially significant implementation details.

Unfortunately, real science makes for a pretty lousy spectator sport :-). Given the context of the release, it was always a near-certainty that early replication attempts would be a random mix of "No" and "Maybe" results. I think our best chance for any meaningful near-term clarity rest with the team of scientists reportedly visiting the original authors in their lab to test the author's own samples. While a positive result from that won't be a definitive replication, it will at least be external validation of the original process and results.

Re: Semiconducting Transport in LK99 reproduction attempt

#26

Post by p-e-w »

Azrael3000 wrote: post #22
p-e-w wrote: post #17

> In addition, when a pressed Pb10-xCux(PO4)6O pellet is located on top of a commercial Nd2Fe14B magnet at room temperature, no repulsion could be felt and no magnetic levitation was observed either. So what about the video[1] that shows magnetic levitation occurring? Since the linked article was unable to reproduce this effect, it seems there are two possibilities: 1. The video is fake (which is really, really hard…

Apparently a new paper is supposed to come out from the original authors about the production method [0]. So it really is unclear whether everybody generates the same material. It's a shame that these papers were published before they were polished by the authors. [0] https://forums.spacebattles.com/threads/claims-of-room-tempe...

> It's a shame that these papers were published before they were polished by the authors.

Indeed. It's also a shame that they chose to use language like:

"We believe that our new development will be a brand-new historical event that opens a new era for humankind."

When you make grandiose boasts like these, you better be fucking certain you are correct.

Re: Semiconducting Transport in LK99 reproduction attempt

#27

Post by carabiner »

TaylorAlexander wrote: post #16
bestcoder69 wrote: post #10

Earlier quoted context omitted.

Could be a skill issue on the part of the replicators? The russian anime girl scientist had to make a bunch of modifications (and was cursing the orig authors) before she could make her rocks float.

Was that fiction? I saw someone mention that the Russian anime girl scientist was fiction.

@8teAPi = Random guy writing Sorkinesque fanfiction about this whole saga.

@iris_IGB = Random Russian anime girl scientist who synth'd in her apartment kitchen.

Re: Semiconducting Transport in LK99 reproduction attempt

#28

Post by justinclift »

Azrael3000 wrote: post #22
p-e-w wrote: post #17

> In addition, when a pressed Pb10-xCux(PO4)6O pellet is located on top of a commercial Nd2Fe14B magnet at room temperature, no repulsion could be felt and no magnetic levitation was observed either. So what about the video[1] that shows magnetic levitation occurring? Since the linked article was unable to reproduce this effect, it seems there are two possibilities: 1. The video is fake (which is really, really hard…

Apparently a new paper is supposed to come out from the original authors about the production method [0]. So it really is unclear whether everybody generates the same material. It's a shame that these papers were published before they were polished by the authors. [0] https://forums.spacebattles.com/threads/claims-of-room-tempe...

> It's a shame that these papers were published before they were polished by the authors.

While that's true, sometimes having some time pressure is useful to make sure a release even happens.

They've apparently been working on this for nearly a quarter of a century already... (!)

Re: Semiconducting Transport in LK99 reproduction attempt

#29

Post by nonethewiser »

p-e-w wrote: post #26
Azrael3000 wrote: post #22

Earlier quoted context omitted.

Apparently a new paper is supposed to come out from the original authors about the production method [0]. So it really is unclear whether everybody generates the same material. It's a shame that these papers were published before they were polished by the authors. [0] https://forums.spacebattles.com/threads/claims-of-room-tempe...

> It's a shame that these papers were published before they were polished by the authors. Indeed. It's also a shame that they chose to use language like: "We believe that our new development will be a brand-new historical event that opens a new era for humankind." When you make grandiose boasts like these, you better be fucking certain you are correct.

You'd think they'd find a new word

Re: Semiconducting Transport in LK99 reproduction attempt

#30

Post by peyton »

a_vanderbilt wrote: post #15

Given the stark contrast in behavior between their sample and the one described in Lee et al., is this even the same material? Surely while the conductive characteristics can be explained by errors in measurement procedure, why would the behavior in a magnetic field be different? Were the original authors being dishonest? Was the replicated material different? The X-ray analysis seems to support that they are very si…

Doesn’t look like they did any annealing. Just tableting. The annealed sample was the one that levitated. Maybe that’s the issue.
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