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Pressure-driven flow of solid helium.

James Day1, John Beamish

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

Physical Review Letters
|April 12, 2006
PubMed
Summary
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Researchers investigated supersolid behavior in solid helium-4. Measurements showed no evidence of flow, contradicting previous findings and placing strict limits on supersolid properties.

Area of Science:

  • Condensed Matter Physics
  • Quantum Materials

Background:

  • Recent experiments suggested a supersolid phase transition in solid helium-4.
  • Torsional oscillator measurements indicated anomalous mass decoupling.

Purpose of the Study:

  • To investigate the flow properties of solid helium-4.
  • To test for supersolid flow under pressure differences.

Main Methods:

  • Utilized a piezoelectrically driven diaphragm.
  • Studied solid helium-4 flow through an array of capillaries.

Main Results:

  • No low-temperature flow of solid helium-4 was detected.
  • Measured flow speed was less than 1.2 x 10(-14) m/s.
  • Supersolid velocity limits are at least 7 orders of magnitude lower than previously inferred.

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Conclusions:

  • Experimental results place stringent restrictions on supersolid flow in solid helium-4.
  • Contradicts interpretations of supersolid phase transition from torsional oscillator experiments.