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Classical rotational inertia of solid 4He.

J G Dash1, J S Wettlaufer

  • 1Department of Physics, University of Washington, Seattle, Washington 98195-1560, USA.

Physical Review Letters
|August 11, 2005
PubMed
Summary

Solid helium-4 (4He) shows reduced rotational inertia, but this may be due to grain boundary premelting, not superfluidity. This phenomenon also explains anomalies in porous glass, suggesting partial superfluidity in liquid helium.

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Area of Science:

  • Condensed matter physics
  • Low-temperature physics
  • Materials science

Background:

  • Reduced rotational inertia in solid 4He suggests superfluidity.
  • An alternative explanation is needed for this observed phenomenon.

Purpose of the Study:

  • To propose an alternative explanation for the reduced rotational inertia in solid 4He.
  • To investigate the role of grain boundary premelting in solid helium behavior.
  • To re-evaluate evidence for superfluidity in solid and liquid helium.

Main Methods:

  • Theoretical calculation of film thickness.
  • Determination of viscosity to explain rotational inertia anomalies.
  • Analysis of grain boundary premelting effects.

Main Results:

  • Grain boundary premelting provides an alternative explanation for reduced rotational inertia in solid 4He.
  • Calculations determined the film thickness and viscosity consistent with observed anomalies.
  • This mechanism also explains inertial anomalies in solid helium within porous glass.

Conclusions:

  • The observed reduced rotational inertia in solid 4He is likely due to grain boundary premelting, not intrinsic superfluidity.
  • Grain boundary premelting offers a unified explanation for inertial anomalies in different solid helium systems.
  • The findings suggest that liquid helium may be partially superfluid under certain conditions.

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