Superfluidity versus localization in bulk 4He at zero temperature

Details Superfluidity versus localization in bulk 4He at zero temperature Superfluidity versus localization in bulk 4He at zero temperature

2006-06-21

arxiv.org/abs/cond-mat/0606543v1

Phys. Rev. B 73, 224515 (2006)

Physics

Condensed Matter

Other Condensed Matter

5 pages,5 figures

Scientific paper

10.1103/PhysRevB.73.224515

We present a zero-temperature quantum Monte Carlo calculation of liquid $^4$He immersed in an array of confining potentials. These external potentials are centered in the lattice sites of a fcc solid geometry and, by modifying their well depth and range, the system evolves from a liquid phase towards a progressively localized system which mimics a solid phase. The superfluid density decreases with increasing order, reaching a value $ \rho_{\rm s}/\rho = 0.079(16)$ when the Lindemann's ratio of the model equals the experimental value for solid $^4$He.

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