Journal of Low Temperature Physics

, Volume 148, Issue 5–6, pp 579–583 | Cite as

Anisotropic Aerogels for Studying Superfluid 3He

  • J. Pollanen
  • S. Blinstein
  • H. Choi
  • J. P. Davis
  • T. M. Lippman
  • L. B. Lurio
  • W. P. Halperin
Article

Abstract

It may be possible to stabilize new superfluid phases of 3He with anisotropic silica aerogels. We discuss two methods that introduce anisotropy in the aerogel on length scales relevant to superfluid 3He. First, anisotropy can be induced with uniaxial strain. A second method generates anisotropy during the growth and drying stages. We have grown cylindrical ∼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 ∼90° out of phase relative to that induced by strain. This has implications for the possible stabilization of superfluid phases with specific symmetry.

PACS

67.57.-z 67.57.Pq 61.10.Eq 

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Copyright information

© Springer Science+Business Media, LLC 2007

Authors and Affiliations

  • J. Pollanen
    • 1
  • S. Blinstein
    • 1
  • H. Choi
    • 1
  • J. P. Davis
    • 1
  • T. M. Lippman
    • 1
  • L. B. Lurio
    • 2
  • W. P. Halperin
    • 1
  1. 1.Department of Physics and AstronomyNorthwestern UniversityEvanstonUSA
  2. 2.Department of PhysicsNorthern Illinois UniversityDeKalbUSA

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