Modification of the He3 phase diagram by anisotropic disorder

Motivated by the recent prediction that uniaxially compressed aerogel can stabilize the anisotropic $A$ phase over the isotropic $B$ phase, we measure the pressure dependent superfluid fraction of $^{3}\mathrm{He}$ entrained in 10% axially compressed, 98% porous aerogel. We observe that a broad region of the temperature-pressure phase diagram is occupied by the metastable $A$ phase. The reappearance of the $A$ phase on warming from the $B$ phase, before superfluidity is extinguished at ${T}_{c}$, is in contrast to its absence in uncompressed aerogel. The phase diagram is modified from that of pure $^{3}\mathrm{He}$, with the disappearance of the polycritical point (PCP) and the appearance of a region of $A$ phase extending below the PCP of bulk $^{3}\mathrm{He}$, even in zero applied magnetic field. The expected alignment of the $A$ phase texture by compression is not observed.