3 ms·
Cool thanks. Gonna read up a little on that. Edit: yea it's interesting. Believe it or not, I studied L-G theory in grad school, taught a lab about (type-II) s
by alecst 3y ago
Cool thanks. Gonna read up a little on that.
Edit: yea it's interesting. Believe it or not, I studied L-G theory in grad school, taught a lab about (type-II) superconductors, but had no idea that type-I superconductors didn't flux pin.
Just leaving this here from Wikipedia:
> The superconductor must be a type-II superconductor because type-I superconductors cannot be penetrated by magnetic fields. Some type-I superconductors can experience the effects of flux pinning if they are thin enough. If the material's thickness is comparable to the London penetration depth, the magnetic field can pass through the material.
https://en.wikipedia.org/wiki/Flux_pinning https://en.wikipedia.org/wiki/Flux_pinning
- adastra22 3y agoAlso to follow up on your original point, this is a purported example of a linear superconductor. There are parallel columnar lines of superconductivity inside the mineral, like a bundle of wires. No such thing has ever been demonstrated before, and it is unlikely to have macro properties like those you are familiar with. For example, flux pinning is (IIRC) due to circular currents induced in the superconductor. But how do you induce a circular current into a straight-line conductive wire with ~zero cross section?
- someplaceguy 3y ago> If the material's thickness is comparable to the London penetration depth, the magnetic field can pass through the material. Indeed. A girl I was seeing told me the same once, but obviously things didn't work out between us...