Anisotropic Aerogels for Studying Superfluid $^3$He

Details Anisotropic Aerogels for Studying Superfluid $^3$He Anisotropic Aerogels for Studying Superfluid $^3$He

2006-06-30

arxiv.org/abs/cond-mat/0606784v2

Physics

Condensed Matter

Superconductivity

6 pages, 4 figures, submitted to Quantum Fluids and Solids (QFS) conference 2006

Scientific paper

10.1007/s10909-007-9449-z

It may be possible to stabilize new superfluid phases of $^{3}$He with anisotropic silica aerogels. We discuss two methods that introduce anisotropy in the aerogel on length scales relevant to superfluid $^{3}$He. First, anisotropy can be induced with uniaxial strain. A second method generates anisotropy during the growth and drying stages. We have grown cylindrical $\sim$98% aerogels with anisotropy indicated by preferential radial shrinkage after supercritical drying and find that this shrinkage correlates with small angle x-ray scattering (SAXS). The growth-induced anisotropy was found to be $\sim90^\circ$ out of phase relative to that induced by strain. This has implications for the possible stabilization of superfluid phases with specific symmetry.

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