Molar Volume Dependence of Static Magnetization and Ordering Temperature in bcc SolidHe3

Nuclear magnetic ordering in bcc ${}_{}{}^3{}_{}{}^{}\mathrm{He}$ has been studied by a static magnetization measurement from 10 down to 0.3 mK for a molar volume region of $V=24.14\mathrm{}$ to $V=22.46\mathrm{}$ ${\mathrm{cm}}^3$/mole. The results show that the ordering temperature $T_{\mathrm{N}}$ varies in proportion to $V^{16.5\pm 1}$ and that the magnetization in the ordered state is constant. The magnetization reduced by its maximum value is found to be represented by a universal function of the reduced temperature $\frac{T}{T_{\mathrm{N}}}$.