Superfluid 3 He under nanoscale confinement has generated significant interest due to the rich spectrum of phases with complex order parameters that may be stabilized. Experiments have uncovered a variety of interesting phenomena, but a complete picture of superfluid 3 He under confinement has remained elusive. Here, we present phase diagrams of superfluid 3 He under varying degrees of uniaxial confinement, over a wide range of pressures, which elucidate the progressive stability of both the A-phase, as well as a growing region of stable pair density wave (PDW) state.

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