[...]
"Titanium nitride films, as well as films prepared from various other materials, can act as either superconductors or insulators, depending on the thickness of the film,' explains Vinokur. 'If you take the film which is just on the insulating side of the transition and decrease the temperature or magnetic field, then the film all of a sudden becomes a superinsulator..."
Related:
https://en.wikipedia.org/wiki/Titanium_nitride
https://www.nature.com/articles/s41598-022-24460-7
>"Recent experiments evidenced that superinsulators are the mirror-twins of superconductors with reversed electric and magnetic field effects."
Perplexity.ai (in response to one of my queries about superinsulators):
>"Superinsulators exhibit unique electric field effects, such as expelling electric fields similarly to how superconductors expel magnetic fields. This results in the formation of thin electric flux filaments within the material."