Superfluidity of Dense ${}^4$He in Vycor

Abstract

We calculate properties of a model of ${}^4$He in Vycor using the Path Integral Monte Carlo method. We find that ${}^4$He forms a distinct layered structure with a highly localized first layer, a disordered second layer with some atoms delocalized and able to give rise to the observed superfluid response, and higher layers nearly perfect crystals. The addition of a single ${}^3$He atom was enough to bring down the total superfluidity by blocking the exchange in the second layer. Our results are consistent with the persistent liquid layer model to explain the observations. Such a model may be relevant to the experiments on bulk solid ${}^4$He, if there is a fine network of grain boundaries in those systems.

4 pages, 4 figures

References in corpus (4)

• Ring exchanges and the supersolid phase of 4He
• Freezing and pressure-driven flow of solid helium in Vycor
• Superfluidity in a Doped Helium Droplet
• Superfluid Interfaces in Quantum Solids

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