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

[mad mathematician]

TL;DR

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?

 

[Frabjous]

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.

 

[Hornbein]

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.

 

[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.

I guess that's why they are called superconductor.
At least one of the reasons.

 

[Steve4Physics]

... is it theoretically even possible to have an operating superconductor at 25 celsius degrees?

I believe the highest temperature currently achieved is -23$^{\circ}$C, which is not that far from +25$^{\circ}$C. But (as already indicated) very high pressures (150GPa - 170GPa) were needed. E.g. see https://news.uchicago.edu/story/scientists-break-record-highest-temperature-superconductor