The distorted axi-planar superfluid phase of 3He in the "nematically ordered" aerogel
I. A. Fomin+, E. V. Surovtsev+*
+Kapitza Institute for Physical Problems of the RAS, 119334 Moscow, Russia
*Moscow Institute of Physics and Technology, 141700 Dolgoprudny, Russia
Abstract
Stimulated by the results of NMR experiments with superfluid
3He in "nematically ordered" aerogel
(R. Sh. Askhadullin, V. V. Dmitriev, D. A. Krasnikhin et al.,
Pis`ma v ZHETF, 95, 355 (2012))
we report on the
results of phenomenological analysis of stability of different phases of
superfluid 3He subjected to a strong homogeneous uniaxial anisotropy. On
a basis of this analysis we suggest a form of the order parameter for the new
ESP2 phase observed in the quoted experiments. In the weak coupling limit the
suggested order parameter approaches that of the axi-planar phase. We discuss
a possible experimental check of the proposed identification of the new
phase.