What is the highest temperature a superconductor can work today?
The superconductor with the highest transition temperature that has been confirmed by more than one independent research groups (a prerequisite to be called a discovery) is mercury barium calcium copper oxide (HgBa2Ca2Cu3O8) at around 133 K.
"From wiki :)"
Thanks for the reply. It will probably take some time to discover some that can work on less extreme temperatures.
Separate names with a comma.