Torsional oscillator and synchrotron x-ray experiments on solid 4He in aerogel (2008)
Mulders, N., West, J. T., Chan, M. H. W., Kodituwakku, C. N., Burns, C. A., Lurio, L. B.
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 effect of 3He impurities on the nonclassical response to oscillation of solid 4He (2007)
Kim, E., Xia, J. S., West, J. T., Lin, X., Clark, A. C., Chan, M. H. W.
We have investigated the influence of impurities on the possible supersolid transition by systematically enriching isotopically-pure 4He (< 1 ppb of 3He) with 3He. The onset of nonclassical...
Nonclassical Rotational Inertia in Single Crystal Helium (2007)
Clark, A. C., West, J. T., Chan, M. H. W.
It has been proposed that the observed nonclassical rotational inertia (NCRI) in solid helium results from the superflow of thin liquid films along interconnected grain boundaries within the sample....