Low Temperature Physics: 41, 445 (2015); https://doi.org/10.1063/1.4922095
Физика Низких Температур: Том 41, Выпуск 6 (Июнь 2015), c. 571-575    ( к оглавлению , назад )

Poisson’s ratio in cryocrystals under pressure

Yu.A. Freiman, Alexei Grechnev, and S.M. Tretyak

B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine 47 Lenin Ave., Kharkov 61103, Ukraine
E-mail: freiman@ilt.kharkov.ua

Alexander F. Goncharov

Geophysical Laboratory, Carnegie Institution of Washington, 5251 Broad Branch Road NW, Washington DC 20015, USA

Center for Energy Matter in Extreme Environments and Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, 350 Shushanghu Road, Hefei, Anhui 230031, China

Eugene Gregoryanz

School of Physics and Centre for Science at Extreme Conditions, University of Edinburgh, Edinburgh EH9 3JZ, UK

Received February 18, 2015


We present results of lattice dynamics calculations of Poisson’s ratio (PR) for solid hydrogen and rare gas solids (He, Ne, Ar, Kr and Xe) under pressure. Using two complementary approaches — the semi-empirical many-body calculations and the first-principle density-functional theory calculations we found three different types of pressure dependencies of PR. While for solid helium PR monotonically decreases with rising pressure, for Ar, Kr, and Xe it monotonically increases with pressure. For solid hydrogen and Ne the pressure dependencies of PR are nonmonotonic displaying rather deep minimums. The role of the intermolecular potentials in this diversity of patterns is discussed.

PACS: 67.80.F– Solids of hydrogen and isotopes;
PACS: 67.80.B– Solid 4He;
PACS: 62.20.dj Poisson’s ratio.

Key words: Poisson’s ratio, rare gas solids, solid hydrogen, intermolecular potential.

Published online: April 23, 2015