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Can someone explain how this video shows superconductivity?

7moritz7 3y ago
It shows the magnetic effects associated with superconductors, which are omnidirectional from my understanding, in contrast to a 'regular magnet'
declan_roberts 3y ago
There's all kinds of cool examples of this using liquid nitrogen to make a superconductor exhibit the Meissner effect. The material in question will have these effects at room temperature and pressure. https://youtu.be/HRLvVkkq5GE?t=53 https://youtu.be/HRLvVkkq5GE?t=53
mrtksn 3y ago
[not an expert but...]It shows strong diamagnetism(being repelled by both of the poles of a magnet), which is a property of superconductors. Not necessarily a superconductor though, that’s still to be established but at least it shows that the inventors are up to something and it’s not complete fabrication.
- RyEgswuCsn 3y ago
  I am no expert on this topic, but I feel this is similar to how ferrofluid forms "spikes" when placed near a magnet. Are they related?
  - mrtksn 3y ago
    I'm not an expert too but AFAIK ferrofluids are actually attracted by magnets. The spikes are probably as a result of having strong and weak locations of magnetic field and the the liquid rushing into those. But yes, Maybe I'm interpreting the video wrongly. Yet, to me it looks like the bulky part of the sample is being repelled by both poles of the magnet as it stands upright with the pointy end at the bottom each time. IMHO if this was due to attraction, the pointy end would be at the top.
  - Nmi2osv7 3y ago
    No. The spikes are pulled toward the magnet (ferromagnetism) whereas superconductivity is repelled by the magnet (diamagnetism.)
- bilsbie 3y ago
  Why don’t they try heating it and seeing if the effect goes away? You could even try a welding torch or something.
  - norturnn 3y ago
    There are better, less destructive ways to test the transition temperature. Apparently LK-99 is hard to make in bulk, so they probably don't want to torch their sample.
  - dylan604 3y ago
    or just stick it outside in a heat dome? don't you have one near you?
    - lost_tourist 3y ago
      lol or a temperature chamber that the vast majority of labs have? heck I made a toaster oven that will go anywhere from 100F to 400F with an arduino and a $3 toaster oven from the junk store.
  - SimbaOnSteroids 3y ago
    Not only is it a purported to be a room temperature super conductor, it's a relatively high temperature superconductor, not guarantee the effect goes away if you put it under a torch.
    - geon 3y ago
      I think the critical temperature was 400 K (127 °C).
      - proto_lambda 3y ago
        As far as I can tell, 127°C is just the highest temperature it was tested at. The critical temperature may be higher.
      - sfink 3y ago
- Palpatineli 3y ago
  That’s a stretch. Dias’ material has real color change under high pressure which is an expected property of superconductors but nobody would argue his paper was not complete fabrication

It shows the magnetic effects associated with superconductors, which are omnidirectional from my understanding, in contrast to a 'regular magnet'

declan_roberts 3y ago

There's all kinds of cool examples of this using liquid nitrogen to make a superconductor exhibit the Meissner effect. The material in question will have these effects at room temperature and pressure. https://youtu.be/HRLvVkkq5GE?t=53 https://youtu.be/HRLvVkkq5GE?t=53

mrtksn 3y ago

[not an expert but...]It shows strong diamagnetism(being repelled by both of the poles of a magnet), which is a property of superconductors. Not necessarily a superconductor though, that’s still to be established but at least it shows that the inventors are up to something and it’s not complete fabrication.

RyEgswuCsn 3y ago
I am no expert on this topic, but I feel this is similar to how ferrofluid forms "spikes" when placed near a magnet. Are they related?
- mrtksn 3y ago
  I'm not an expert too but AFAIK ferrofluids are actually attracted by magnets. The spikes are probably as a result of having strong and weak locations of magnetic field and the the liquid rushing into those. But yes, Maybe I'm interpreting the video wrongly. Yet, to me it looks like the bulky part of the sample is being repelled by both poles of the magnet as it stands upright with the pointy end at the bottom each time. IMHO if this was due to attraction, the pointy end would be at the top.
- Nmi2osv7 3y ago
  No. The spikes are pulled toward the magnet (ferromagnetism) whereas superconductivity is repelled by the magnet (diamagnetism.)
bilsbie 3y ago
Why don’t they try heating it and seeing if the effect goes away? You could even try a welding torch or something.
- norturnn 3y ago
  There are better, less destructive ways to test the transition temperature. Apparently LK-99 is hard to make in bulk, so they probably don't want to torch their sample.
- dylan604 3y ago
  or just stick it outside in a heat dome? don't you have one near you?
  - lost_tourist 3y ago
    lol or a temperature chamber that the vast majority of labs have? heck I made a toaster oven that will go anywhere from 100F to 400F with an arduino and a $3 toaster oven from the junk store.
- SimbaOnSteroids 3y ago
  Not only is it a purported to be a room temperature super conductor, it's a relatively high temperature superconductor, not guarantee the effect goes away if you put it under a torch.
  - geon 3y ago
    I think the critical temperature was 400 K (127 °C).
    - proto_lambda 3y ago
      As far as I can tell, 127°C is just the highest temperature it was tested at. The critical temperature may be higher.
    - sfink 3y ago
Palpatineli 3y ago
That’s a stretch. Dias’ material has real color change under high pressure which is an expected property of superconductors but nobody would argue his paper was not complete fabrication