Stability of superfluid 3He-B in compressed aerogel

Abstract

In recent work it was shown that new anisotropic p-wave states of superfluid 3He can be stabilized within high porosity silica aerogel under uniform positive strain [1]. In contrast, the equilibrium phase in an unstrained aerogel, is the isotropic superfluid B-phase [2]. Here we report that this phase 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 the anisotropic A-phase resulting in a tricritical point for A, B, and normal phases with a critical field of ~100 mT. From pulsed NMR measurements we identify these phases and the orientation of the angular momentum.

4 pages and 3 figures

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• Half-quantum vortices and walls bounded by strings in the polar-distorted phases of topological superfluid ${}^3$He
• Anisotropic 2D Larkin-Imry-Ma state in polar distorted ABM phase of 3He in "nematically ordered" aerogel
• Superfluid 3He in Aerogel
• Anisotropic phases of superfluid 3He in compressed aerogel
• The Effect of Magnetic Impurities on Superfluid ${}^3$He in Aerogel
• New Phases of Superfluid ${}^3$He Confined in Aerogels
• Vortex-bound solitons in topological superfluid ${}^3$He
• Planar and Nematic Aerogels: DLCA and Superfluid 3He
• Superfluid ${}^3$He in Planar Aerogel
• Magnetic Susceptibility of Andreev Bound States in Superfluid ${}^3$He-B
• Orbital-Flop Transition of Angular Momentum in a Topological Superfluid
• Fibration, Nexus and Cosmological Composite Topological Defects in Uniaxially Disordered Superfluid ${}^3$He