title: Freezing and pressure-driven flow of solid helium in Vycor.
abstract: The recent torsional oscillator results of Kim and Chan suggest a supersolid phase transition in solid 4He confined in Vycor. We have used a capacitive technique to directly monitor density changes for helium confined in Vycor at low temperature and have used a piezoelectrically driven diaphragm to study the pressure-induced flow of solid helium into the Vycor pores. Our measurements showed no indication of a mass redistribution in the Vycor that could mimic supersolid decoupling and put an upper limit of about 0.003 microm/s on any pressure-induced supersolid flow in the pores of Vycor.
authors.affiliation: Department of Physics, University of Alberta, Edmonton, Canada T6J 2G1.
authors.forename: James
authors.initials: J
authors.lastname: Day
authors.forename: Tobias
authors.initials: T
authors.lastname: Herman
authors.forename: John
authors.initials: J
authors.lastname: Beamish