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Superfluidity of grain boundaries in solid 4He.

L Pollet1, M Boninsegni, A B Kuklov

  • 1Theoretische Physik, ETH Zürich, 8093 Zürich, Switzerland.

Physical Review Letters
|May 16, 2007
PubMed
Summary

Grain boundaries in helium-4 (4He) crystals are generally superfluid at low temperatures. This superfluidity is intrinsic and not merely a crack filled with liquid, challenging previous assumptions.

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Area of Science:

  • Condensed Matter Physics
  • Quantum Fluids

Background:

  • Grain boundaries in solid helium-4 (4He) have been a subject of research regarding their physical properties.
  • Previous observations suggested superfluidity at grain boundaries, but its nature and origin were debated.

Purpose of the Study:

  • To investigate the intrinsic superfluid properties of grain boundaries in 4He crystals.
  • To determine the conditions under which grain boundaries exhibit superfluidity.
  • To clarify the relationship between grain boundary structure and superfluid behavior.

Main Methods:

  • Large-scale quantum Monte Carlo simulations were employed.
  • Simulations focused on analyzing the behavior of 4He at grain boundaries under varying conditions.

Main Results:

  • Grain boundaries in 4He crystals are generically superfluid at low temperatures (around 0.5 K at melting pressure).
  • Nonsuperfluid grain boundaries occur only for specific crystallographic orientations.
  • Superfluidity is an intrinsic property of the grain boundary, not simply a crack filled with superfluid.
  • Superfluid grain boundaries do not require proximity to the melting line.

Conclusions:

  • Grain boundaries in 4He are fundamentally superfluid under typical low-temperature conditions.
  • The observed superfluidity is an intrinsic characteristic of the grain boundary itself.
  • This finding clarifies the nature of grain boundary superfluidity in quantum crystals.