For superfluid 3He in a model aerogel with finite uniaxial anisotropy, the polar-phase transition temperature stays nearly independent of impurity scattering, extending Anderson's theorem beyond the infinitely anisotropic limit.
Influence of Magnetic Scattering on Superfluidity of 3He in Nematic Aerogel
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abstract
We report results of experiments with superfluid 3He confined in aerogels with parallel strands which lead to anisotropic scattering of 3He quasiparticles. We vary boundary conditions for the scattering by covering the strands by different numbers of atomic 4He layers and observe that the superfluid phase diagram and the nature of superfluid phases strongly depend on the coverage. We assume that the main reason of these phenomena is a magnetic channel of the scattering which becomes important at low coverages. Our results show that the magnetic channel also may be important in other Fermi systems with the triplet pairing.
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Impact of Strong Anisotropy on Phase Diagram of Superfluid $^3$He in Aerogels
For superfluid 3He in a model aerogel with finite uniaxial anisotropy, the polar-phase transition temperature stays nearly independent of impurity scattering, extending Anderson's theorem beyond the infinitely anisotropic limit.