Abstract
A mutual action of the random anisotropy brought in the superfluid 3He by aerogel and of the global anisotropy caused by its deformation is considered. Strong global anisotropy tends to suppress fluctuations of orientation of the order parameter and stabilizes ABM order parameter. In a limit of vanishing anisotropy fluctuations of ABM order parameter became critical. It is argued that still in a region of small fluctuations the order parameter changes its form to be less sensitive to the random anisotropy. For a favorable landscape of the free energy of superfluid 3He the fluctuations remain small even in a limit of vanishing global anisotropy and the long-range order is maintained.
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Fomin, I.A. Long-Range Order in the A-like Phase of Superfluid 3He in Aerogel. J Low Temp Phys 150, 464–471 (2008). https://doi.org/10.1007/s10909-007-9572-x
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DOI: https://doi.org/10.1007/s10909-007-9572-x