DOI: 10.1103/physrevb.73.092505
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Abstract: We extend previous calculations of the zero temperature superfluid fraction f s (SFF) vs localization, from the fcc lattice to the experimentally realized (for solid 4 He) hcp and bcc lattices.The superfluid velocity is assumed to be a one-body function, and dependent only on the local density, taken to be a sum over sites of gaussians of width σ. Localization is defined as σ/d, with d the nearest-neighbor distance. As expected, for fcc and bcc lattices the superfluid density tensor is proportional to the uni…

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