Supersolid
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A supersolid is a spatially ordered superfluid.
 Phase diagram for 4He |
When quantum fluids, like helium-4, are cooled below a certain characteristic temperature, they undergo the superfluid transition and enter a state of 0 viscosity. It has been theorised that quantum fluids can undergo a similar transition from the solid phase.
See also
External link
- Nature story on a supersolid experiment (http://www.nature.com/nsu/040112/040112-7.html)