# Supersolidity and Disorder in Solid Helium 4

@article{Caupin2008SupersolidityAD,
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},
year={2008},
volume={150},
pages={267-275}
}
• Published 2008
• Materials Science
• 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
6 Citations

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#### References

SHOWING 1-10 OF 27 REFERENCES
Disorder and the Supersolid State of Solid He4
• Materials Science, Physics
• 2007
We report torsional oscillator supersolid studies of highly disordered samples of solid $^{4}\mathrm{He}$. In an attempt to approach the amorphous or glassy state of the solid, we prepare our samplesExpand
Observation of classical rotational inertia and nonclassical supersolid signals in solid 4He below 250 mK.
• Physics, Medicine
• Physical review letters
• 2006
The nonclassical rotational inertia signal is not a universal property of solid 4He but can be eliminated through an annealing of the solid helium sample, which has important implications for the understanding of the supersolid state. Expand
Supersolidity and Superfluidity of Grain Boundaries
• Physics
• 2007
Abstract We have looked for dc mass transport through solid 4He in a simple experiment with two communicating vessels filled with solid 4He in equilibrium with liquid 4He. Through good qualityExpand
Bose-Einstein condensation of incommensurate solid 4He.
• Physics, Medicine
• Physical review letters
• 2006
The one-body density matrix in solid 4He is computed by means of an exact ground state projector method in which incommensurability occurs spontaneously and finds a vacancy induced Bose-Einstein condensation of about 0.23 atoms per vacancy at a pressure of 54 bar. Expand
Observation of Superflow in Solid Helium
• Physics, Medicine
• Science
• 2004
We report on the observation of nonclassical rotational inertia in solid helium-4 confined to an annular channel in a sample cell under torsional motion, demonstrating superfluid behavior. The effectExpand
Superfluidity of grain boundaries in solid 4He.
• Physics, Medicine
• Physical review letters
• 2007
By large-scale quantum Monte Carlo simulations we show that grain boundaries in 4He crystals are generically superfluid at low temperature, with a transition temperature of the order of approximatelyExpand
Annealing Effect for Supersolid Fraction in 4He
• Materials Science, Physics
• 2007
Abstract We report on experimental confirmation of the non-classical rotational inertia (NCRI) in solid helium samples originally reported by Kim and Chan. The onset of NCRI was observed atExpand
The surface of helium crystals
• Physics
• 2005
Helium crystals exhibit faceting as do ordinary crystals, but no other crystals can grow and melt sufficiently fast to make the propagation of crystallization waves possible at their surfaces. AfterExpand
Pressure-driven flow of solid helium.
• Physics, Materials Science
• Physical review letters
• 2006
A piezoelectrically driven diaphragm is used to study the flow of solid helium through an array of capillaries, showing no indication of low temperature flow and placing stringent restrictions on supersolid flow in response to a pressure difference. Expand
Wetting Properties of Grain Boundaries in Solid 4He.
• Materials Science, Physics
• Physical review letters
• 2007
It is found that, when emerging at the liquid-solid interface, a grain boundary makes a groove whose dihedral angle 2theta is nonzero, which shows that grain boundaries are not completely wet by the liquid phase, in agreement with recent Monte Carlo simulations. Expand