Magnetization and ac susceptibility of hcp solidHe3near the nuclear ordering temperature

The magnetization and the ac susceptibility of hcp solid ${}_{}{}^3{}_{}{}^{}\mathrm{He}$ have been measured for molar volumes V from 18.34 to 19.29 ${\mathrm{cm}}^3$/mole at temperatures down to 38 μK. The Weiss temperature obtained from the magnetization is proportional to ${\mathit{V}}^{18.4\pm 0.6}$. The Zeeman-exchange relaxation time obtained from the ac susceptibility indicates the appearance of the critical phenomenon for the sample with 19.29 ${\mathrm{cm}}^3$/mole.