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Evidence for a high-temperature disorder-induced mobility in solid 4He.

A Eyal1, O Pelleg, L Embon

  • 1Department of Physics, Technion-Israel Institute of Technology, Haifa 32000, Israel. satanan@tx.technion.ac.il

Physical Review Letters
|September 28, 2010
PubMed
Summary
This summary is machine-generated.

Experiments on solid helium-4 revealed supersolid-like phenomena at higher temperatures (1.3–1.9 K). These findings, including mass decoupling and altered dissipation, challenge current interpretations of supersolidity in helium-4 solid phases.

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Area of Science:

  • Low-temperature physics
  • Condensed matter physics
  • Quantum phenomena

Background:

  • Solid helium-4 exhibits unusual behavior at very low temperatures, with phenomena debated as potential supersolidity.
  • Previous studies focused on temperatures below 0.2 K, leaving higher temperature regimes less explored.

Purpose of the Study:

  • To investigate the presence of supersolid-like phenomena in solid helium-4 at higher temperatures (1.3–1.9 K).
  • To compare observed behaviors with those previously reported at cryogenic temperatures.

Main Methods:

  • Torsional oscillator experiments were conducted on solid helium-4.
  • Measurements were performed across both body-centered cubic (bcc) and hexagonal close-packed (hcp) solid phases.
  • Experiments spanned a temperature range of 1.3 K to 1.9 K.

Main Results:

  • Phenomena analogous to those observed in presumed supersolid helium-4 below 0.2 K were detected.
  • Key observations include partial decoupling of the solid helium mass from the oscillator.
  • Changes in dissipation and velocity-dependent decoupling of mass were also recorded in both bcc and hcp phases.

Conclusions:

  • The study demonstrates that supersolid-like behaviors in solid helium-4 are not exclusive to ultra-low temperatures.
  • The onset of these phenomena correlates with crystalline disorder, independent of specific crystalline symmetry or temperature.
  • These findings necessitate a re-evaluation of the conditions and mechanisms underlying supersolidity in helium-4.