Superfluid $β$ phase in liquid $^3$He

Abstract: We report the first observation of superfluid $\beta$ phase of $<sup>3$He. This phase is realized in $<sup>3$He in nematic aerogel in presence of high magnetic field right below the superfluid transition temperature. We use a vibrating aerogel resonator to detect the transition to the $\beta$ phase and measure the region of existence of this phase.