Raumtemperatur-Supraleiter

Supraleiter bei Raumtemperatur: Wieso Experten skeptisch sind

Die Entdeckung eines vermeintlichen Supraleiters wird als Durchbruch gefeiert. Das ruft Kritiker*innen auf den Plan.

Link: futurezone.at

Andrew Cote (@Andercot)

First claimed successful replication of LK-99

Accomplished by a team at the Huazhong University of Science and Technology and posted 30 minutes ago.

Why this is evidence:
The LK-99 flake slightly levitates for both orientations of the magnetic field, meaning it is not simply a magnetized piece of iron or similar 'magnetic material'. A simple magnetic flake would be attracted to one polarity of the strong magnet, and repelled by the other. A diamagnet would be repelled under either orientation, since it resists and expels all fields regardless of the polarity.

Caveats
There is no way to verify the orientation of the strong magnet in this video, also, there are yet to be published experimental measured values of this sample. Diamagnetism is a property of superconductors but without measured and verified data, this is just suggestive of a result.

Take-away
If this synthesis was indeed successful, then this material is easy enough to be made by labs other than the original research team. I would watch carefully for results out of Argonne National Lab, who are reported to be working on their own synthesis of a sample.

This overall corroborates two independent simulation studies that investigated the original Korean authors claim about material and crystal structure, and both studies supported the claims.

Lawrence Berkeley National Lab: https://arxiv.org/pdf/2307.16892.pdf
Shenyang National Lab: https://arxiv.org/pdf/2307.16040.pdf

The attached video shows a small flake of their sample responding to an external magnetic field. I scroll through the video to skip to the relevant part.

original video credit to: @altryne

Link: https://nitter.privacydev.net/Ander...286684424691712

Lídia del Rio (@azul@mastodon.uno)

@sineatrix@sciencemastodon.com

It says, paraphrasing, "Yes there's something to #LK99!! Put copper in the right place and you'll see a bunch of promising effects. Caveat: copper tends to slide to the wrong place, so it's hard to keep it in the right place. That may be why you're not managing to synthesise the material. But keep trying! And explore similar materials while you're at it!"

Or, in the science-speak of the paper...

Link: mastodon.uno

Erster Supraleiter bei Zimmertemperatur

Erster Supraleiter bei Zimmertemperatur Supraleiter sind Sehnsuchtsobjekte der Technik, denn sie leiten Strom ohne Widerstand. Nachteil bisher: Sie tun das nur bei extremer Kälte. US-Physiker haben nun den ersten Supraleiter vorgestellt, der auch bei Zimmertemperatur funktioniert – doch auch er hat noch einen entscheidenden Nachteil. Link: science.orf.at Bei 15°C, braucht lediglich 267 Gigapascal Druck (rund das 2,5-Millionenfache des Luftdrucks in der Erdatmosphäre)

Link: www.overclockers.at