189 citations · 422 across the 9 of their papers we have counts for
6 papers · 1 filter
Threefold Reduction in Thermal Conductivity of Vycor Glass Due to Adsorption of Liquid 4He
Zhigang Cheng, Moses H. W. Chan
We report thermal conductivity measurements of porous Vycor glass when it is empty and when the pores are filled with helium between 0.06 and 0.5 K. The filling of liquid 3He and l…
He Crystal Quality and Rotational Response in a Transparent Torsional Oscillator
A. D. Fefferman, X. Rojas, A. Haziot +3
We have studied natural purity He single crystals and polycrystals between 10 and 600 mK using a torsional oscillator with a 2 cm rigid cell made of sapphire with a smo…
Influence of Ortho-H2 Clusters on the Mechanical Properties of Solid Para-H2
A. C. Clark, Z. G. Cheng, M. Bowne +2
The quantum diffusion of ortho-H2 impurities in solid para-H2 has been investigated with a torsional oscillator technique. The unclustering dynamics of agglomerated impurities with…
Supersolid behavior in confined geometry
J. T. West, X. Lin, Z. G. Cheng +1
We have carried out torsional oscillator (TO) and heat capacity (HC) measurements on solid 4He samples grown within a geometry which restricts the helium to thin (150 um) cylindric…
Nonclassical Rotational Inertia in Single Crystal Helium
A. C. Clark, J. T. West, M. H. W. Chan
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…
Search for Superfluidity in Solid Hydrogen
A. C. Clark, X. Lin, M. H. W. Chan
A torsional oscillator study of solid para-hydrogen has been carried out down to 20 mK in search for evidence of superfluidity. This work was inspired by the observation of the sup…