Pairing states of superfluid 3He in uniaxially anisotropic aerogel

Stable pairing states of superfluid He-3 in aerogel are examined in the case with a global uniaxial anisotropy which may be created by applying a uniaxial stress to the aerogel. Due to such a global anisotropy, the stability region of an Anderson-Brinkman-Morel (ABM) pairing state becomes wider. In a uniaxially stretched aerogel, the pure polar pairing state with a horizontal line node is predicted to occur, as a three-dimensional superfluid phase, over a measurable width just below the superfluid transition at T-c(P). A possible relevance of the present results to the case with no global anisotropy is also discussed.