There’s no known way to prove a three-dimensional “quantum spin liquid” exists, so Rice University physicists and their collaborators did the next best thing: They showed their single crystals of cerium zirconium pyrochlore had the right stuff to qualify as the first possible 3-D version of the long-sought state of matter.
Source:
https://phys.org/news/2019-07-physicists-d-quantum-liquid.html