6 ms·

I don't see why people go crazy over this, the meissner effect in superconductors look different.

by subzel0 3y ago

willis936 3y ago
How so?
- subzel0 3y ago
  The rock should float for a start.
  - blueflow 3y ago
    Meissner Effect does not mean it has to float. It only floats if thats the easiest way to expulse the magnet field. Otherwise it aligns normally with the magnetic field, which is supposedly happening here.
  - supriyo-biswas 3y ago
    As it’s been theorized elsewhere, it may be that the production processes produce a material with only bits of the theorized superconductor in it, leading to the wiggling effect we see here as well as the Chinese replication video.
    - sanxiyn 3y ago
      It is not a purity issue. On the other hand, 1D superconductors are expected to behave this way. See my other comments.
      - benj111 3y ago
        How do we know it isn't a purity issue?
Timon3 3y ago
I don't understand what you're not seeing. Nobody is saying that the whole LK-99 sample is superconducting. Why would you expect the whole sample to float, instead of "partial floating" as we're seeing, if you have a material that's only partially superconducting?
- danbruc 3y ago
  I was wondering this, why do all the samples not completely float. If the sample is only partially superconducting, could you just smash it into smaller pieces and find a few floating ones? Or would the different domains be so small that you have to turn the sample into dust before you get a completely superconducting piece? Probably can not be answered in general as it heavily depends on the synthesis process?
  - netsec_burn 3y ago
    That's what is currently being done! A few videos have surfaced of smaller grains of LK-99 fully levitating. We're waiting for additional confirmation.
  - sanxiyn 3y ago
    洗芝溪 answered this on Zhihu. All his answers are extremely good. This user knows something. 这应该还是材料的各向异性, 也就是它的准一维结构导致. 因为材料当中有一个固定晶相, 那个方向的抗磁性最强, 所以磁感线总会沿着这个方向走, 导致所有样品都是竖起来的. This should be due to the anisotropy of the material, that is, its quasi-one-dimensional structure. Because there is a fixed crystal phase in the material, that direction has the strongest diamagnetism, so the magnetic field lines will always go along this direction, causing all The samples are all upright. https://www.zhihu.com/question/615044128/answer/3145337312 https://www.zhihu.com/question/615044128/answer/3145337312
    - yorwba 3y ago
      If the material is a one-dimensional superconductor where current can only flow with zero resistance along one direction, aligning that direction with the magnetic field lines should produce the weakest diagmanetism, because the magnetic force is proportional to the cross product of current and magnetic field. If the two are parallel, the force is zero. Of course this could explain why the sample doesn't lift off: it starts out with the superconducting direction at an angle to the magnetic field and relatively strong diamagnetism leading to a righting force until the two directions are nearly aligned and the diamagnetism is too weak to overcome gravity.
brucethemoose2 3y ago
Some speculate its a monocrystsline "1D" superconductor, which could explain its different behavior. But that is out of my depth. I am still trying to wrap my head around a directional superconductor/resistor...
majani 3y ago
I'm guessing this is the crappy v1 that barely does what it's supposed to. Still represents a giant leap for mankind

I don't see why people go crazy over this, the meissner effect in superconductors look different.

willis936 3y ago

How so?

subzel0 3y ago
The rock should float for a start.
- blueflow 3y ago
  Meissner Effect does not mean it has to float. It only floats if thats the easiest way to expulse the magnet field. Otherwise it aligns normally with the magnetic field, which is supposedly happening here.
- supriyo-biswas 3y ago
  As it’s been theorized elsewhere, it may be that the production processes produce a material with only bits of the theorized superconductor in it, leading to the wiggling effect we see here as well as the Chinese replication video.
  - sanxiyn 3y ago
    It is not a purity issue. On the other hand, 1D superconductors are expected to behave this way. See my other comments.
    - benj111 3y ago
      How do we know it isn't a purity issue?

Timon3 3y ago

I don't understand what you're not seeing. Nobody is saying that the whole LK-99 sample is superconducting. Why would you expect the whole sample to float, instead of "partial floating" as we're seeing, if you have a material that's only partially superconducting?

danbruc 3y ago
I was wondering this, why do all the samples not completely float. If the sample is only partially superconducting, could you just smash it into smaller pieces and find a few floating ones? Or would the different domains be so small that you have to turn the sample into dust before you get a completely superconducting piece? Probably can not be answered in general as it heavily depends on the synthesis process?
- netsec_burn 3y ago
  That's what is currently being done! A few videos have surfaced of smaller grains of LK-99 fully levitating. We're waiting for additional confirmation.
- sanxiyn 3y ago
  洗芝溪 answered this on Zhihu. All his answers are extremely good. This user knows something. 这应该还是材料的各向异性, 也就是它的准一维结构导致. 因为材料当中有一个固定晶相, 那个方向的抗磁性最强, 所以磁感线总会沿着这个方向走, 导致所有样品都是竖起来的. This should be due to the anisotropy of the material, that is, its quasi-one-dimensional structure. Because there is a fixed crystal phase in the material, that direction has the strongest diamagnetism, so the magnetic field lines will always go along this direction, causing all The samples are all upright. https://www.zhihu.com/question/615044128/answer/3145337312 https://www.zhihu.com/question/615044128/answer/3145337312
  - yorwba 3y ago
    If the material is a one-dimensional superconductor where current can only flow with zero resistance along one direction, aligning that direction with the magnetic field lines should produce the weakest diagmanetism, because the magnetic force is proportional to the cross product of current and magnetic field. If the two are parallel, the force is zero. Of course this could explain why the sample doesn't lift off: it starts out with the superconducting direction at an angle to the magnetic field and relatively strong diamagnetism leading to a righting force until the two directions are nearly aligned and the diamagnetism is too weak to overcome gravity.

brucethemoose2 3y ago

Some speculate its a monocrystsline "1D" superconductor, which could explain its different behavior. But that is out of my depth. I am still trying to wrap my head around a directional superconductor/resistor...

majani 3y ago

I'm guessing this is the crappy v1 that barely does what it's supposed to. Still represents a giant leap for mankind