A1 and A2 transitions in superfluid 3He in 98% porosity aerogel -: art. no. 145302

Superfluid He-3 in high porosity aerogel is the system in which the effects of static impurities on a p-wave superfluid can be investigated in a systematic manner. We performed shear acoustic impedance measurements on this system (98% porosity aerogel) in the presence of magnetic fields up to 15 T at the sample pressures of 28.4 and 33.5 bars. We observed the splitting of the superfluid transition into two transitions in high fields in both bulk and liquid in aerogel. The field dependence of the splitting in aerogel resembles that of the bulk superfluid He-3 caused by the presence and growth of the A(1) phase. Our results provide the first evidence of the A(1) phase in superfluid He-3/aerogel.