Local stress and superfluid properties of solid Helium-4

Details Local stress and superfluid properties of solid Helium-4 Local stress and superfluid properties of solid Helium-4

2008-05-23

arxiv.org/abs/0805.3713v1

Phys. Rev. Lett. 101, 097202 (2008)

Physics

Condensed Matter

Statistical Mechanics

Scientific paper

10.1103/PhysRevLett.101.097202

More than half a century ago Penrose asked: are the superfluid and solid state of matter mutually exclusive or do there exist "supersolid" materials where the atoms form a regular lattice and simultaneously flow without friction? Recent experiments provide evidence that supersolid behavior indeed exists in Helium-4 -- the most quantum material known in Nature. In this paper we show that large local strain in the vicinity of crystalline defects is the origin of supersolidity in Helium-4. Although ideal crystals of Helium-4 are not supersolid, the gap for vacancy creation closes when applying a moderate stress. While a homogeneous system simply becomes unstable at this point, the stressed core of crystalline defects (dislocations and grain boundaries) undergoes a radical transformation and can become superfluid.

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