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- W2212824377 abstract "The neutron-inelastic-scattering technique was used to measure the phonon dispersion relations in two high-density crystals of hcp $^{4}mathrm{He}$ with molar volumes of 11.61 and 9.41 ${mathrm{cm}}^{3}$/mol. These densities are on the order of twice that of $^{4}mathrm{He}$ at 30 bars. The crystals were grown from the melt in the fcc phase, and cooled across the fcc-hcp phase transition. The observed phonon spectra show anharmonic effects much less prominent than those observed in earlier measurements at 21 ${mathrm{cm}}^{3}$/mol. In particular, multiphonon interference effects were not found to be very pronounced, while multiphonon scattering appeared to influence phonon line shapes strongly for large wave-vector and energy transfers. Elastic constants difmmode dot{e}else .{e}fi{}termined from the initial slopes of the dispersion curves were found to be in good agreement with those calculated by Goldman using the first-order self-consistent-phonon theory. The dependence on volume of the phonon energies is discussed with reference to the earlier studies at 21.1 and 16.0 ${mathrm{cm}}^{3}$/mol. No significant dispersion of mode Gruneisen parameters was found unlike the case of fcc He. Gruneisen parameters were found to depend on volume approximately in a manner given by Ahlers for the thermodynamic Gruneisen parameter." @default.
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- W2212824377 date "1978-10-01" @default.
- W2212824377 modified "2023-09-23" @default.
- W2212824377 title "Lattice dynamics of hcpHe4at high pressure" @default.
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- W2212824377 doi "https://doi.org/10.1103/physrevb.18.3074" @default.
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