4He crystal quality and rotational response in a transparent torsional oscillator

A. D. Fefferman, X. Rojas, A. Haziot, S. Balibar, J. T. West, M. H.W. Chan

Research output: Contribution to journalArticlepeer-review

23 Scopus citations


We have studied natural purity 4He single crystals and polycrystals between 10 and 600 mK using a torsional oscillator with a 2 cm3 rigid cell made of sapphire with a smooth geometry. As the temperature was lowered, we observed sample-dependent but reproducible resonant frequency shifts that could be attributed to a supersolid fraction of order 0.1%. However, these shifts were observed with single crystals, not with polycrystals. Our results indicate that, in our case, the rotational anomaly of solid helium is more likely due to a change in stiffness than to supersolidity. This interpretation would presumably require gliding of dislocations in more directions than previously thought.

Original languageEnglish (US)
Article number094103
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number9
StatePublished - Mar 13 2012

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics


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