FBAR

[Liv Boeree @Liv_Boeree]

RIP LK-99, and thank you for reinvigorating the public’s interest in physics, you had a good run

[Parrot Capital 🦜 @ParrotCapital]

Sam Bankman-Fried is going to cooperate with the @SDNYnews to rat on everyone in crypto to reduce his prison stay.

SBF has lawyer parents.
They'll tell him to talk.
Sam squealing will lead to arrests.

CZ, Alex Mashinsky, Justin Sun, Tether.
They're all going down.
Be ready. 💣

[Derrick VanGennep @VanGennepD]

I was able to closely mimic the “levitation” behavior of LK-99 with a ferromagnetic sample.

For comparison, see the original LK-99 video in the tweet below.

[Alex Kaplan @alexkaplan0]

Eg:

[Andrew Côté @Andercot]

First video of LK-99 Full Levitation, aka flux-pinning

This video was just posted to the Chinese video-sharing site BiliBili and claims to be a highly pure synthesized sample of LK-99.

What is the physical phenomenon behind this and what does it mean?

Levitation of superconducting materials is a phenomenon unique to what is called Type-II superconductors, and is an effect whereby magnetic field lines becomes 'trapped' as it passes through the material, providing the force needed to levitate. These are the popular images and videos of cryogenically-cooled discs floating above a magnet frequently seen online and in the pinned post on my profile.

You can think of this like strands of hair being caught in gum - the gum is suspended in mid-air by adhering strongly to the hair as the hair passes through it. The hair in this case is magnetic field lines and the gum is the Type-II superconductor. Just like hair comes in individual strands, or in other words hair is 'quantized' or 'discrete', so is the flux trapped at the 'pinning centers' quantized in what are called 'magnetic vortices' - the quantization of pinned flux lines is a key property and distinguishing characteristic of Type-II superconductors (although technically can occur in Type-I superconductors if the material thickness is smaller than the London penetration depth, which is indeed very small - specifics for the physics nerds out there).

Flux-pinning is entirely unique to superconductors and is also wholly distinct from the Meissner effect. It is not a property of diamagnets or diamagnetism.

At @TRIUMFLab I contributed to flux-pinning studies in Niobium crystal superconducting radio-frequency cavities used for particle acceleration. In that application, trapped flux poses an issue by increasing the remnant surface resistivity of the cavity, which has the effect of decreasing its effective quality factor or Q-factor, which is a measurement of a resonators efficiency. SRF cavities typically have Q-factors of 10E10 and trapped flux at pinning centers reduces the maximum effective accelerating electric field used to drive charged particle bunches close to the speed of light.

Flux pinning is thought to arise in some Type-II superconductors by small imperfections in the crystal, also called volume defects, that enable flux to penetrate the material. In SRF cavities an issue that arises is any magnetic field that is passing through the material, e.g. by the Earth's background field, can become pinned or trapped inside the cavity as it transitions into a superconducting state. See some attached plots in the comments from a study showing how the surface resistivity of SRF cavities increases the more there is a background field as the cavity transitions into superconducting state.

This is the first video I am aware of that claims to show the flux-pinned levitation of a LK-99 sample. If this is in fact what is happening, then it is a very unique and promising finding of this new materials properties and potential for future study.

If this is real then it is truly ground-breaking

[soybeans @soybeannasa]

#LK99 One of the attempts to reproduce failed

[Dark Iris @fatalhorse]

Really BAD news about #LK99 from a group of Japanese scientists 😥

"We regret to inform that the LK99 does not work; it is not real. We are all disappointed with this confirmation and will provide more details soon. It is regrettable that everything has taken these proportions."

[Jesus Lares @jelares]

I reached out to a colleague of mine from MIT re: replicating the experiment. He’s a world-leading expert and professor in superconductivity.

Maybe best not to rush into anything

[FBAR @penliyu3]

@EconomyApp Would you do an analysis for Broadcom?

[FBAR @penliyu3]

@CelsiansNetwork @Mashinsky @sdanielleon @NukeGold Not surprising by now. The management is corrupted

[FBAR @penliyu3]

@CelsiansNetwork @Mashinsky @sdanielleon Any chance clawback

[Kanyon Industries @auditore_k]

New technological breakthroughs
“If I didn't tell you, would you think she was real?”
#GirlsFrontline #M4SOPMODII #stablediffusion #AI

[FBAR @penliyu3]

@SimonDixonTwitt @Kirkland_Ellis So what now?

[FBAR @penliyu3]

@OpenAIERC @OpenAIChat_BOT The best company!

[FBAR @penliyu3]

@BitRumors @Mashinsky WTF, a bankrupt company asks another bankrupt company to pay for its hole

[Elon Musk @elonmusk]

And … we just hit another all-time high in Twitter usage lol

[生醫不科科 @Biomedbookerker]

這是本週學術界最大的事件．UC工會要求博士生薪水$54k+,博後薪水$70k+. 在加州大城市拿NIH scale生活的確是很辛苦．加州的大學中目前給博後最高的應該是史丹佛的$68k. 所有UC所在城市應該都沒Palo Alto生活貴，估計最後會協商出一個數字．
祝福UC的研究生和博後能得到更好的待遇

[Mark Zimmerman @TheeMarkZ]

DRX is the greatest underdog story possible in LoL. It can’t be topped.

Negative winrate in LCK.

4th seed.

From playins.

Beat previous world champs.

Beat #1 from their region.

Beat the Goat Faker. In game 5.

You cannot make a bigger underdog story.

Defts final dance ends.