Supersolidity and Disorder in Solid Helium 4

  title={Supersolidity and Disorder in Solid Helium 4},
  author={Fr{\'e}d{\'e}ric Caupin and Satoshi Sasaki and S{\'e}bastien Balibar},
  journal={Journal of Low Temperature Physics},
Abstract Supersolidity is a rather controversial issue which has been revived recently by a number of torsional oscillator (ac-rotation) experiments with solid helium 4. One possibility would be that the ground state of helium 4 crystals contains a Bose-Einstein condensate of mobile vacancies. However, the supersolid signal was shown to depend on sample history. In addition, dc-flow experiments show that superfluid transport of mass does not occur in solid helium, except if it contains… Expand
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