Low Temperature Physics: 39, 556 (2013); https://doi.org/10.1063/1.4811262 (5 pages)
Физика Низких Температур: Том 39, Выпуск 6 (Июнь 2013), c. 716-721    ( к оглавлению , назад )

Elastic properties of compressed cryocrystals in a deformed atom model

Ie.Ie. Gorbenko1, I.V. Zhikharev1,2, E.P. Troitskaya2, Val.V. Chabanenko2, and E.A. Pilipenko2

1Lugansk Taras Shevchenko National University, Oboronna Str., Lugansk 91011, Ukraine
E-mail: e_g81@mail.ru

2Donetsk A.A. Galkin Physics and Technology Institute of the National Academy of Sciences of Ukraine 72 R. Luxemburg Str., Donetsk 83114, Ukraine

Received September 24, 2012


A model with deformed atom shells is built to investigate the elastic properties of rare-gas crystals Ne and Kr under high pressure. It is shown that the observed deviation from the Cauchy relation δ cannot be adequately reproduced with taking into account of only the many-body interaction. The individual pressure dependence δ of is a result of competition of the many-body interaction and the quadrupole interaction associated with the quadrupole-type deformation of electron shells of the atoms during the displacements of the nuclei. Each kind of interaction makes a strongly pressure dependent contribution to δ . In the case of Ne and Kr, contributions of these interactions are compensated to the good precision, providing δ being almost constant against pressure.

PACS: 62.50.–p High-pressure effects in solids and liquids;
PACS: 62.65.+k Acoustical properties of solids;
PACS: 64.10.+h General theory of equations of state and phase equilibria.

Ключевые слова: rare-gas crystals, high pressure, quadrupole deformation, elastic properties, Cauchy relation.