Earlier quoted context omitted.
Just give it to me straight - when will the levitation give us hoverboards?
As long as you only want them to hover over a magnet...
[deleted]
The first room-temperature ambient-pressure superconductor?
261–270 of 906 posts
Re: The first room-temperature ambient-pressure superconductor?
#262Earlier quoted context omitted.
Unlike those guys in Rochester, this seems to be a good experiment that is testing many of the signs of superconductivity.
The actual picture of (poor) levitation in the paper you linked is pretty compelling. This isn’t a complex, noisy measurement showing something that’s related to superconductivity — this is a magnet and a supposed superconductor repelling each other. As far as I know, that’s possible with permanent magnets (and it would be weird, but not impossible, if the group instead synthesized a novel ferromagnet and didn’t noti…
Believe it or not, the levitation effect can be found in non-superconducting materials with a high diamagnetic constant such as pyrolytic carbon. Induced magnetic fields are created by "effective currents," which can occur in zero-resistance systems that are not called superconductors (because they can't conduct across a significant distance, only around a tiny loop) like molecular or atomic orbitals.
Re: The first room-temperature ambient-pressure superconductor?
#263Earlier quoted context omitted.
Video: https://www.youtube.com/watch?v=EtVjGWpbE7k I really need someone to bring me down a notch. This is too exciting!
That video isn't very convincing. The usual test is that the material can float above the magnet.
The effect is weak, but seeing that it behaves the same by flipping the magnet means that it can't be a standard magnet like we're used to seeing. (If I understood some of the other comments correctly).
Other comments. https://news.ycombinator.com/item?id=36867758
Re: The first room-temperature ambient-pressure superconductor?
#264Earlier quoted context omitted.
A moving magnetic field will move around any conductor, it doesn't have to be superconducting. A better video would be nice.
But it wouldn't lock the target in place when they stop, which is what this video demonstrates very well. The conductor would move towards the magnet and try to stick to it.
>The conductor would move towards the magnet and try to stick to it.
No, only ferromagnetic material would behave like that. Copper foil will also move in a moving magnetic field, and won't be attracted to a stationary magnet.
Re: The first room-temperature ambient-pressure superconductor?
#265The method to produce this material as described in the related paper [1] is fairly simple and could be done at home with a $200 home metal melting furnace from amazon and the precursors (which also seem to be fairly standard easy to obtain metals). If this is real, I'd expect some smart people from hackaday / youtube to reproduce this within weeks if not days. If this is real, it'll change society quickly and perman…
> it'll change society quickly
True.
> and permanently for the better.
You can't know that.
Re: The first room-temperature ambient-pressure superconductor?
#266Earlier quoted context omitted.
They claim to have observed the Meisner effect, quantum locking unique to superconductors, a pretty big signal, so more likely fraud than a mistake.
Yeah, very probably fraud. Only puzzle is why they would choose something so easy for other labs to try (and fail) to replicate.
Desperate people do crazy things. This is career-ending fraud. South Korea has the highest suicide rate in the world. The pressure to achieve is enormous and makes people shortsighted.
Re: The first room-temperature ambient-pressure superconductor?
#267Earlier quoted context omitted.
Video: https://www.youtube.com/watch?v=EtVjGWpbE7k I really need someone to bring me down a notch. This is too exciting!
What material and setup could even fake that result?
Well normal copper does this in presence of a strong magnet. I don't think we are seeing superconductivity, just regular copper Meissner effect. Super conductive would frame lock the copper. right?
Re: The first room-temperature ambient-pressure superconductor?
#268Earlier quoted context omitted.
Just give it to me straight - when will the levitation give us hoverboards?
As long as you only want them to hover over a magnet...
Assuming the lift is there or the magnets are strong enough, it would be plausible to have an electromagnetic hover skate park where you could pay by the hour, and possibly even future X-game like events where the boards and riders could move in any direction they can get acceleration in.
Re: The first room-temperature ambient-pressure superconductor?
#269Earlier quoted context omitted.
Superconductors have a current limit above which they are no longer superconductors. It is possible that a room temperature superconductor could be created that has a limit too low to be of any practical use. It seems this is worth cautious excitement, but don't get too excited yet.
The abstract says that T_c is 127 C, which should be comfortably above room temperature for most of the planet
GP is talking about the current density rather than the temperature.
Re: The first room-temperature ambient-pressure superconductor?
#270Earlier quoted context omitted.
What kind of energy density could we get using it for energy storage? Maybe it’s competitive with batteries if you don’t need any cooling?
Superconductors are a transferring energy technology, not a storing energy technology. Although they would likely augment the efficiency of storage technologies.
[deleted]