On the Supersolid State of Matter

Details On the Supersolid State of Matter On the Supersolid State of Matter

2004-09-18

arxiv.org/abs/cond-mat/0409472v2

Physics

Condensed Matter

Statistical Mechanics

4 figures, 4 pages

Scientific paper

10.1103/PhysRevLett.94.155302

We prove that the necessary condition for a solid to be also a superfluid is to have zero-point vacancies, or interstitial atoms, or both, as an integral part of the ground state. As a consequence, superfluidity is not possible in commensurate solids which break continuous translation symmetry. We discuss recent experiment by Kim and Chan [Nature, {\bf 427}, 225 (2004)] in the context of this theorem, question its bulk supersolid interpretation, and offer an alternative explanation in terms of superfluid helium interfaces.

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