Journal
JOURNAL OF PHYSICS-CONDENSED MATTER
Volume 20, Issue 29, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0953-8984/20/29/295230
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The compressibility of solid helium (He-3 and He-4) in the hcp and fcc phases has been studied by the path-integral Monte Carlo method. 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 the temperature increases from the low-temperature limit to the melting temperature. The isotopic effect on the bulk modulus of helium crystals has been quantified for 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 also been quantified from results obtained in both NPT and NVT simulations.
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