Phenomenological phase diagram of superfluid 3He in a stretched aerogel
Abstract
Highly anisotropic "nematically ordered" aerogel induces global uniaxial anisotropy in superfluid 3He. The anisotropy lowers symmetry of 3He in aerogel from spherical to axial. As a result instead of one transition temperature in the state, characterized by the orbital moment l=1 there are two, corresponding to projections l_z=o and l_z=\pm 1. The splitting of transition has a pronounced effect on the phase diagram of superfluid 3He and on a structures of appearing phases. Possible phase diagrams, obtained phenomenologically on a basis of Landau expansion of thermodynamic potential in a vicinity of the transition temperature are presented here. The order parameters, corresponding to each phase and their temperature dependencies are found.
Keywords
Cite
@article{arxiv.1401.7297,
title = {Phenomenological phase diagram of superfluid 3He in a stretched aerogel},
author = {I. A. Fomin},
journal= {arXiv preprint arXiv:1401.7297},
year = {2015}
}
Comments
10 pages, accepted for publication in ZhETF. A few typos are corrected, more exact experimental data for an average diameter of a strand is quoted in the introduction