Random anisotropy disorder in superfluid 3He-A in aerogel
G. E. Volovik
Low Temperature Laboratory, Helsinki University of Technology, FIN-02015 HUT, Finland
Landau Institute for Theoretical Physics RAS, 119334 Moscow, Russia
PACS: 61.30.-v, 67.57.-z, 75.10.Nr
Abstract
The anisotropic superfluid 3He-A in aerogel provides an
interesting example of a system with continuous symmetry in the presence
of random anisotropy disorder. Recent NMR experiments allow us to discuss
two regimes of the orientational disorder, which have different
NMR properties. One of them, the (s)-state,
is identified as the pure Larkin-Imry-Ma state. The structure of another
state, the (f)-state, is not very clear: probably it is the Larkin-Imry-Ma
state contaminated by the network of the topological defects pinned by
aerogel.