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