Many substances change their properties when they are cooled below a certain critical temperature. Such a phase transition occurs, for example, when water freezes. However, in certain metals there are phase transitions that do not exist in the macrocosm. They arise because of the special laws of quantum mechanics that apply in the realm of nature’s smallest building blocks.
Click here for original story, When electrons slowly vanish during cooling: Researchers observe an effect unique to the quantum world
Source: Phys.org