Phys. Rev. Lett. 94, 235301 (2005) [4 pages]Classical Rotational Inertia of Solid 4HeReceived 23 December 2004; published 16 June 2005 The observation of reduced rotational inertia in a cell containing solid 4He has been interpreted as evidence for superfluidity of the solid. We propose an alternative explanation: slippage of the solid, due to grain boundary premelting between the solid and dense adsorbed layers at the container wall. We calculate the range of film thickness, and determine the viscosity that will account for the missing rotational inertia. Grain boundary premelting also explains inertial anomalies in an earlier study of solid helium in porous glass and indicates that the liquid is partially superfluid. © 2005 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.94.235301
DOI:
10.1103/PhysRevLett.94.235301
PACS:
67.80.−s, 67.40.Hf, 67.57.De, 67.57.Np
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