Lattice distortion in hcp rare gas solids

Details Lattice distortion in hcp rare gas solids Lattice distortion in hcp rare gas solids

2009-11-30

arxiv.org/abs/0911.5600v1

Physics

Condensed Matter

Other Condensed Matter

Submitted to Low. Temp. Phys., 14 pages, 5 figures

Scientific paper

The lattice distortion parameter $\delta \equiv c/a-\sqrt{8/3}$ has been calculated as a function of molar volume for the hcp phases of He, Ar, Kr and Xe. Results from both semi-empirical potentials and density functional theory are presented. Our study shows that $\delta$ is negative for helium in the entire pressure range. For Ar, Kr and Xe, however, $\delta$ changes sign from negative to positive as the pressure increases, growing rapidly in magnitude at higher pressures.

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