Torsional oscillator and synchrotron x-ray experiments on solid He4 in aerogel

N. Mulders, J. T. West, M. H.W. Chan, C. N. Kodituwakku, C. A. Burns, L. B. Lurio

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X-ray diffraction experiments show that solid He4 grown in aerogel is highly polycrystalline, with an hcp crystal structure (as in bulk) and a crystallite size of approximately 100 nm. In contrast to the expectation that the highly disordered solid will have a large supersolid fraction, torsional oscillator measurements show a behavior that is strikingly similar to high purity crystals grown from the superfluid phase. The low temperature supersolid fraction is only ∼3×10-4, and the onset temperature is ∼100mK.

Original languageEnglish (US)
Article number165303
JournalPhysical review letters
Issue number16
StatePublished - Oct 16 2008

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy


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