Stability of the axial phase of superfluid He3 in aerogel with globally anisotropic scattering

It has been suggested that anisotropic quasiparticle scattering will stabilize anisotropic phases of superfluid He3 contained within a highly porous silica aerogel. For example, global anisotropy introduced via uniaxial compression of aerogel might stabilize the axial state, which is called the A -phase in bulk superfluid He3. Here, we present measurements of the phase diagram of superfluid He3 in a 98% porous silica aerogel by using transverse acoustic impedance methods. We show that uniaxial compression of the aerogel by 17% does not stabilize an axial phase.