Torsional oscillator and synchrotron x-ray experiments on solid 4He in aerogel

Details Torsional oscillator and synchrotron x-ray experiments on solid 4He in aerogel Torsional oscillator and synchrotron x-ray experiments on solid 4He in aerogel

2008-08-21

arxiv.org/abs/0808.2871v1

Physics

Condensed Matter

Other Condensed Matter

Scientific paper

10.1103/PhysRevLett.101.165303

X-ray diffraction experiments show that solid 4He grown in aerogel is highly polycrystalline, with a 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 ~3x10-4 and the onset temperature is ~ 100 mK.

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