A group from Nagoya University in Japan has discovered a never-before-seen form of ruthenium phosphide with an unusual configuration of atoms and electrons in its cooled state. This may resolve the puzzle of how a metal can be a conductor at high temperatures, but an insulator at lower temperatures.
Click here for original story, Mechanism of metal-to-insulator transition in ruthenium phosphide suggests a new way of looking at solids
Source: Phys.org