Torsional oscillator and synchrotron X-Ray experiments on solid 4He in aerogel |
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Authors: | Mulders N West J T Chan M H W Kodituwakku C N Burns C A Lurio L B |
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Institution: | Department of Physics and Astronomy, University of Delaware, Newark, DE 19716, USA. |
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Abstract: | X-ray diffraction experiments show that solid 4He 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 approximately 3 x 10(-4), and the onset temperature is approximately 100 mK. |
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