I Is it theoretically even possible to operate a superconductor at 25C?

mad mathematician
Messages
104
Reaction score
15
TL;DR Summary
celsius degree?
The question is in the title.
I'll just repeat it, is it theoretically even possible to have an operating superconductor at 25 celsius degrees?

What is the theoertical threshold temprature that beyond it the superconductor doesn't function as such?
 
Physics news on Phys.org
The theory isn’t good enough. The best one can say is that it is not theoretically impossible.

For materials where Cooper pairs are the mechanism, the limit is 30-40K.
 
  • Like
Likes pines-demon and mad mathematician
There is an additional condition : ordinary pressure. Get enough pressure and anything will collapse into a superconductor even at extremely high temperatures. Such pressures are not practical here on Earth though.
 
Last edited:
Hornbein said:
There is an additional condition : ordinary pressure. Get enough pressure and anything will collapse into a superconductor even at extremely high temperatures. Such pressures are not practical here on Earth though.
I guess that's why they are called superconductor.
At least one of the reasons.
 
From the BCS theory of superconductivity is well known that the superfluid density smoothly decreases with increasing temperature. Annihilated superfluid carriers become normal and lose their momenta on lattice atoms. So if we induce a persistent supercurrent in a ring below Tc and after that slowly increase the temperature, we must observe a decrease in the actual supercurrent, because the density of electron pairs and total supercurrent momentum decrease. However, this supercurrent...

Similar threads

Back
Top