Superfluidity of Grain Boundaries and Supersolid Behavior

Superfluidity of Grain Boundaries and Supersolid Behavior

When two communicating vessels are filled to a different height with liquid, the two levels equilibrate because the liquid can flow. We have looked for such equilibration with solid ⁴He. For crystals with no grain boundaries, we see no flow of mass, whereas for crystals containing several grain boun...

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Veröffentlicht in:Science (American Association for the Advancement of Science) 2006-08, Vol.313 (5790), p.1098-1100
Hauptverfasser: Sasaki, S, Ishiguro, R, Caupin, F, Maris, H.J, Balibar, S
Format: Artikel
Sprache:eng
Schlagworte:
Boson degeneracy and superfluidity of 4he
Condensed matter: structure, mechanical and thermal properties
Critical velocity
Crystal lattices
Crystals
Exact sciences and technology
Flow velocity
Grain boundaries
Liquids
Mass flow
Neurons
Physics
Quantum fluids and solids
liquid and solid helium
Solids
Superfluidity
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Beschreibung
Zusammenfassung:When two communicating vessels are filled to a different height with liquid, the two levels equilibrate because the liquid can flow. We have looked for such equilibration with solid ⁴He. For crystals with no grain boundaries, we see no flow of mass, whereas for crystals containing several grain boundaries, we detect a mass flow. Our results suggest that the transport of mass is due to the superfluidity of grain boundaries.
ISSN:0036-8075
1095-9203
DOI:10.1126/science.1130879