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- W2040547854 abstract "The high-pressure equation of state and elastic properties of solid He $(^{4}mathrm{He})$ have been calculated using density functional theory formulated in the framework of the exact muffin-tin orbitals method. The theoretical results, obtained within the generalized gradient approximation for the exchange-correlation functional, are in good agreement with the experimental data available for pressures between $13phantom{rule{0.3em}{0ex}}mathrm{GPa}$ and $32phantom{rule{0.3em}{0ex}}mathrm{GPa}$. We predict that at $0phantom{rule{0.3em}{0ex}}mathrm{K}$ the hexagonal phase of He remains mechanically and thermodynamically stable up to the highest pressure considered in the present study $(ensuremath{sim}150phantom{rule{0.3em}{0ex}}mathrm{GPa})$. The calculated anisotropy ratios of He are similar to those observed in the case of hexagonal metals with $c∕aensuremath{sim}1.63$. On the other hand, we find that hydrostatic pressure has negligible effect on the anisotropy of He. This indicates that He can be used as a quasihydrostatic medium in high-pressure experiments up to at least $150phantom{rule{0.3em}{0ex}}mathrm{GPa}$." @default.
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- W2040547854 date "2005-11-07" @default.
- W2040547854 modified "2023-10-05" @default.
- W2040547854 title "<i>Ab initio</i>calculation of elastic properties of solid He under pressure" @default.
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- W2040547854 doi "https://doi.org/10.1103/physrevb.72.172102" @default.
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