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Superglass phase of 4He.

Massimo Boninsegni1, Nikolay Prokof'ev, Boris Svistunov

  • 1Department of Physics, University of Alberta, Edmonton, Alberta T6G 2J1, Canada.

Physical Review Letters
|April 12, 2006
PubMed
Summary

The study reveals that the low-temperature properties of helium-4 (4He) depend on its initial state. Disordered 4He freezes into a unique superglass, a metastable solid with superfluidity, unlike insulating crystalline 4He.

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The Solid Phase of <sup>4</sup>He: A Monte Carlo Simulation Study.

Entropy (Basel, Switzerland)·2023

Area of Science:

  • Condensed matter physics
  • Quantum fluids

Background:

  • Solid phases of Helium-4 (4He) exhibit unique quantum phenomena.
  • Understanding the low-temperature behavior of 4He is crucial for quantum physics.

Purpose of the Study:

  • Investigate the different solid phases of 4He.
  • Explore the impact of initial conditions on low-temperature properties.
  • Characterize the nature of the superglass phase.

Main Methods:

  • Path integral Monte Carlo simulations.
  • Utilized a recently developed worm algorithm.
  • Simulations started from a high-gas phase quenched to 0.2 K.

Main Results:

  • Low-temperature properties are highly dependent on the initial state.
  • An ideal hexagonal close-packed (hcp) crystal of 4He behaves as an insulator.
  • A disordered system freezes into a superglass, a metastable amorphous solid.
  • The superglass phase exhibits off-diagonal long-range order and superfluidity.

Conclusions:

  • The initial state critically determines the low-temperature solid phase of 4He.
  • Superglass represents a novel metastable state of matter with both solid and superfluid characteristics.
  • Highlights the complex phase diagram of quantum solids.

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