Top Tweets for #MeissnerEffect
This is not Science Fiction! This is the Meissner effect.
A superconductor expels all magnetic fields from its interior and floats above a magnet — completely stable and without any energy input.
Real quantum physics, visible to the naked eye.
#MeissnerEffect #Superconductivity #QuantumPhysics #Physics
महत्त्वपूर्ण शब्दावली:
मैसनर प्रभाव (Meissner Effect)
https://t.co/YkuLDlST2j
#MeissnerEffect #importantterminology #importantwords #prelims #importantconcepts #India #upsc #prelimssexam #pcs #sanskritiias
Clear signature of the Meissner effect in our latest sample! Nothing more exciting than seeing textbook superconductivity in action using a standard QD MPMS system. #superconductivity #MeissnerEffect #materials
Meissner effect: A superconductor pushes out magnets when it cools. 🧊🧲
#Superconductivity #MeissnerEffect #Physics
https://t.co/7gN4Q6aKZa
#MEB #İntegral 🇹🇷 #The Science of #QuantumLevitation
The reason this works is something called the #Meissnereffect and #magneticfluxpinning #Japon 🇯🇵 #Train
Good to see full levitation of #LK99
Brings back memories of #MeissnerEffect #STEM #outreach activities - Guaranteed #WOWFactor, kindled curiosities and inquiry in young minds.
Expensive semiconductors, ultra freezing coolants like liquid nitrogen made it less accessible!
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
@andrewmccalip So, I asked GPT-4: "Why would a sample of a superconductive material only float on one side?" #LK99 #MeissnerEffect
Lai, et al used Density Functional Theory to study #LK99,
found volume contraction & 'flat energy bands' near #FermiLevel. #superconductivity path: 1D, explain imperfect #MeissnerEffect or partial levitation? silver or gold atoms may improve performance of LK99-like materials.
Evidence of LK-99 being a #superconductor: the #resistivity of sample 2 (measured at 30 mA by four-probe method) decrease with T, and becomes 0 below 60∘C. #MeissnerEffect: temperature-dependent diamagnetic susceptibilities of zero-field cool(ZFC) & field cool (FC) in samples
Korean #Scientists claimed success in synthesizing #roomtemperature #superconductor, Tc≥400 K at ambient pressure with modified lead-apatite (#LK99) structure, proved with #CriticalTemperature, #ZeroResistivity, #Criticalcurrent & #magneticfield, #MeissnerEffect. #EnergyLoss
"Efecto Meissner" - #generative #generativeart #p5js #techspressionism #creativecoding #programacioncreativa #meissnereffect #creativejavascript #physicsart #mathart https://t.co/528G6Ql4Qj
I've seen some pretty cool demos of the #MeissnerEffect over the years, but getting these actors' disembodied heads to levitate over a magnet?
Priceless!
#Superconducting #Thespians
[Fig. A.36] Magnetic fields cannot penetrate inside superconductors: this is called Meissner effect. In this picture, a block of tin cooled to -271 °C and placed inside an electromagnet expels the magnetic flux lines. #artscience #meissner #meissnerEffect #superconductors
![largedeviations's tweet photo. [Fig. A.36] Magnetic fields cannot penetrate inside superconductors: this is called Meissner effect. In this picture, a block of tin cooled to -271 °C and placed inside an electromagnet expels the magnetic flux lines. #artscience #meissner #meissnerEffect #superconductors https://t.co/5HxJEgunqX](https://pbs.twimg.com/media/FEZMpdaWYAgWCx8.jpg)
Large copper ring spinning with a motor. Eddy currents generated by the copper. An NdFeB #magnet is put over the rotating copper. The magnet levitates until the RPM of the copper gets low enough. The magnet lowers like the #MeissnerEffect in reverse.
New book points to scientific evidence for the effect of group practice of Transcendental Meditation of establishing peace and prosperity in a country.
https://t.co/njVNEJRjvB
#TranscendentalMeditation #MaharishiEffect #MaharishiMaheshYogi #meissnereffect #fieldofconsciousness
In physics class today we saw a superconductor levitate a magnet. The cool things our students can see today! #PhysicsPuns #MeissnerEffect
The #MeissnerEffect in action! A neodymium magnet completely hovers over an Yttrium-Barium-Copper Oxide #Superconductor cooled with Liquid Nitrogen in #MaterialsScience today!
Experimenting with #LevitatingSuperconductors and the #MeissnerEffect at TWHS in #MaterialsScience today! Pour -320 degree liquid nitrogen on the superconducting ceramic to create a perfect conductor at extreme low temperature and the expulsion of magnetic flux!
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