Compressibility of solid helium

Details Compressibility of solid helium Compressibility of solid helium

2008-07-09

arxiv.org/abs/0807.1339v1

J. Phys.: Condens. Matter 20, 295230 (2008)

Physics

Condensed Matter

Materials Science

9 pages, 7 figures

Scientific paper

10.1088/0953-8984/20/29/295230

The compressibility of solid helium (3He and 4He) in the hcp and fcc phases has been studied by path-integral Monte Carlo. Simulations were carried out in both canonical (NVT) and isothermal-isobaric (NPT) ensembles at temperatures between 10 and 300 K, showing consistent results in both ensembles. For pressures between 4 and 10 GPa, the bulk modulus B is found to decrease by about 10 %, when temperature increases from the low-temperature limit to the melting temperature. The isotopic effect on the bulk modulus of helium crystals has been quantified in a wide range of parameters. At 25 K and pressures on the order of 1 GPa, the relative difference between 3He and 4He amounts to about 2 %. The thermal expansion has been also quantified from results obtained in both NPT and NVT simulations.

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