Lattice dynamic theory of compressed rare-gases crystals in the deformed atom model

Details Lattice dynamic theory of compressed rare-gases crystals in the deformed atom model Lattice dynamic theory of compressed rare-gases crystals in the deformed atom model

2012-03-14

arxiv.org/abs/1203.3040v1

Physics

Condensed Matter

Other Condensed Matter

20 pages,3 figures and 1 Table

Scientific paper

Lattice dynamics of rare-gas crystals is built on the base of adiabatic approximation when the deformation of electron shells of atoms of dipole and quadrupole types depending on nucleus shift and simultaneously arising Van-der-Vaals forces. The dipole forces are the most long-range ones. The obtained oscillation equations are studied in long-wave approximation. The role of three-body interaction and quadrupole deformation in the violation of Cauchy relation is discussed. Birch elastic moduli calculated for Xe and deviations from Cauchy relation are in good agreement with the experiment in a wide pressure range.

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