Spontaneous supercrystal discovered in switching metal-insulator

https://phys.org/news/2024-07-spontaneous-supercrystal-metal-insulator.html

"thin-film Mott insulator Ca2RuO4 spontaneously forms anisotropic, organized 10-nm structure embedded in supercrystal with multiple spatial periods phase domain hierarchy with different length scales during cooling <200 to 250°K... it is a switch controlling electricity balance between competing ground states... switch between conductivity and non-conductivity, as well as switch in the preferential direction of the current... energy-efficient computer memory, optical switches"