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In recent work it was shown that new anisotropic p-wave states of superfluid3He can be stabilized within high porosity silica aerogel under uniformpositive strain [1]. In contrast, the equilibrium phase in an unstrainedaerogel, is the isotropic superfluid B-phase [2]. Here we report that thisphase stability depends on the sign of the strain. For negative strain of ~20%achieved by compression, the B-phase can be made more stable than theanisotropic A-phase resulting in a tricritical point for A, B, and normalphases with a critical field of ~100 mT. From pulsed NMR measurements weidentify these phases and the orientation of the angular momentum.

Stability of superfluid 3He-B in compressed aerogel