Look for Yttrium-Barium-Copper oxide that superconducts when cooled with liquid nitrogen. This is "cheap" cooling that will never run out. https://www.kjmagnet

Look for Yttrium-Barium-Copper oxide that superconducts when cooled with liquid nitrogen. This is "cheap" cooling that will never run out. https://www.kjmagnetics.com/blog.asp?p=superconductors#:~:text=Yttrium%2Dbarium%2Dcopper%2Doxide,boils%20at%2077K%20(%2D196C) https://www.kjmagnetics.com/blog.asp?p=superconductors#:~:te....