AnomalousPV(T)of SolidHe3in High Magnetic Fields

The low-temperature variation of the pressure at constant volume of a 24-${\mathrm{cm}}^3$/mole ${\mathrm{s}\mathrm{o}\mathrm{l}\mathrm{i}\mathrm{d}-}^3$He sample has been measured at 40.3 and 57.2 kG. No difference was observed from the zero-field curve. This result is thermodynamically inconsistent with previous measurements on solid ${}_{}{}^3{}_{}{}^{}\mathrm{He}$ if the system is in equilibrium. Implications of this anomalous result are discussed.