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Supersolidity and Disorder in Solid Helium 4

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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 appropriate grain boundaries. As a consequence, we believe that supersolidity is not an intrinsic property of helium single crystals, but that it is due to quenched disorder. We report experiments on pressure relaxation in and light scattering from solid samples, that give additional evidence for the existence of disorder in helium crystals. We also describe our recent study of the wetting properties of grain boundaries.

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Authors and Affiliations

  1. Laboratoire de Physique Statistique de l’Ecole Normale Supérieure, ENS-CNRS-Paris 6-Paris 7, 24, rue Lhomond, 75005, Paris, France

    Frédéric Caupin, Satoshi Sasaki & Sébastien Balibar

Authors
  1. Frédéric Caupin
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  2. Satoshi Sasaki
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  3. Sébastien Balibar
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Correspondence to Frédéric Caupin.

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Caupin, F., Sasaki, S. & Balibar, S. Supersolidity and Disorder in Solid Helium 4. J Low Temp Phys 150, 267–275 (2008). https://doi.org/10.1007/s10909-007-9545-0

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  • DOI: https://doi.org/10.1007/s10909-007-9545-0

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