Tretyak, S.M.; Antsygina, T.N.; Freiman, Yu.A.
(Физика низких температур, 2006)
The hcp lattice distortion parameter δ, the deviation of c/a ratio from the ideal hcp value √ 8/3 , have been calculated for solid He under pressure taking into account two- and three-body interatomic forces. The resulting ...