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Freezing and pressure-driven flow of solid helium in Vycor

James Day·Tobias Herman·John Beamish
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Abstract

The recent torsional oscillator results of Kim and Chan suggest a supersolid phase transition in solid He-4 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 um/s on any pressure-induced supersolid flow in the pores of Vycor.

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James Day, Tobias Herman, John Beamish. 2005-06-23. Freezing and pressure-driven flow of solid helium in Vycor. https://doi.org/10.1103/physrevlett.95.035301

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