There are proposed superinsulators. "superinsulators are the mirror-twins of superconductors with reversed electric and magnetic field effects" https://www.na

There are proposed superinsulators. "superinsulators are the mirror-twins of superconductors with reversed electric and magnetic field effects" https://www.nature.com/articles/s41598-022-24460-7 https://www.nature.com/articles/s41598-022-24460-7