Phys. Rev. Lett. 95, 035301 (2005) [4 pages]Freezing and Pressure-Driven Flow of Solid Helium in VycorReceived 12 March 2005; published 12 July 2005 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 μm/s on any pressure-induced supersolid flow in the pores of Vycor. © 2005 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.95.035301
DOI:
10.1103/PhysRevLett.95.035301
PACS:
67.80.−s, 65.80.+n, 66.30.−h, 66.35.+a
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