Low-field phase boundaries of bcc solidHe3

The low-field phase boundaries of bcc solid ${}_{}{}^3{}_{}{}^{}\mathrm{He}$ at V=24.18 ${\mathrm{cm}}^3$/mole were determined from isochoric pressure measurements. We clarified that the critical magnetic field ${\mathit{B}}_{\mathit{N}}$ of the transition line between the low-field and the paramagnetic phases was described as ${\mathit{B}}_{\mathit{N}}$∼ √${\mathit{T}}_{\mathit{N}}$(0)-${\mathit{T}}_{\mathit{N}}$(${\mathit{B}}_{\mathit{N}}$) as a function of the critical temperature ${\mathit{T}}_{\mathit{N}}$. The sharp kink at the triple point along the low-field phase boundary indicates that the transition between the high-field and paramagnetic phases is first order near the triple point.