Effects of Magnetic Field on the "A" Transition in LiquidHe3

In an applied magnetic field the "$A$" transition in liquid ${}_{}{}^3{}_{}{}^{}\mathrm{He}$ (at 2.7 mK on the melting curve) splits into two discrete transitions, occuring at different temperatures. This effect has been observed both in pressure-versus-time measurements in two different compressional cooling cells and in the attenuation of 10-MHz zero sound. The magnitude of the temperature splitting, in units of pressure along the melting curve, is $0.20H$ mbar for $H$ in kOe. A third pressure-versus-time feature has been observed near $A$ at high fields, but is not accompanied by an attenuation peak.