Probable observation of a supersolid helium phase

@article{Kim2004ProbableOO,
  title={Probable observation of a supersolid helium phase},
  author={E. Kim and Moses H. W. Chan},
  journal={Nature},
  year={2004},
  volume={427},
  pages={225-227}
}
When liquid 4He is cooled below 2.176 K, it undergoes a phase transition—Bose–Einstein condensation—and becomes a superfluid with zero viscosity. Once in such a state, it can flow without dissipation even through pores of atomic dimensions. Although it is intuitive to associate superflow only with the liquid phase, it has been proposed theoretically that superflow can also occur in the solid phase of 4He. Owing to quantum mechanical fluctuations, delocalized vacancies and defects are expected… Expand
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