skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Compressed Silica Aerogels for the Study of Superfluid [superscript 3]He

Abstract

We have performed Small Angle X-ray Scattering (SAXS) on uniaxially strained aerogels and measured the strain-induced structural anisotropy. We use a model to connect our SAXS results to anisotropy of the {sup 3}He quasiparticle mean free path in aerogel. Measurements of the low temperature phase diagram of superfluid {sup 3}He in 98% aerogel indicate a stable B-phase and a metastable A-like phase. Vicente et al. proposed that the relative stability of these phases can be attributed to local anisotropic scattering of the 3He quasiparticles by the aerogel network. This network consists of silica strands with a diameter of {approx} 30 {angstrom} and average separation {zeta}{sub a} {approx} 300 {angstrom}. Vicente et al. also proposed using uniaxial strain of the aerogel to produce global anisotropy. We have performed SAXS on two uniaxially strained aerogels and found that strain introduces anisotropy on the {approx}100 {angstrom} length scale. We relate this to anisotropy of the quasiparticle mean free path, {lambda}.

Authors:
; ; ; ; ; ; ;  [1];  [2];  [2]
  1. (NIU)
  2. (
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Org.:
USDOE
OSTI Identifier:
1008982
Resource Type:
Conference
Resource Relation:
Conference: 24th International Conference on Low Temperature Physics;August 10-17, 2005;Orlando, FLA
Country of Publication:
United States
Language:
ENGLISH
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ANISOTROPY; HELIUM 3; MEAN FREE PATH; PHASE DIAGRAMS; PHYSICS; SCATTERING; SILICA; STABILITY; STRAINS; SUPERFLUIDITY

Citation Formats

Pollanen, J., Choi, H., Davis, J.P., Blinstein, S., Lippman, T.M., Lurio, L.B., Mulders, N., Halperin, W.P., Delaware), and NWU). Compressed Silica Aerogels for the Study of Superfluid [superscript 3]He. United States: N. p., 2007. Web.
Pollanen, J., Choi, H., Davis, J.P., Blinstein, S., Lippman, T.M., Lurio, L.B., Mulders, N., Halperin, W.P., Delaware), & NWU). Compressed Silica Aerogels for the Study of Superfluid [superscript 3]He. United States.
Pollanen, J., Choi, H., Davis, J.P., Blinstein, S., Lippman, T.M., Lurio, L.B., Mulders, N., Halperin, W.P., Delaware), and NWU). Fri . "Compressed Silica Aerogels for the Study of Superfluid [superscript 3]He". United States. doi:.
@article{osti_1008982,
title = {Compressed Silica Aerogels for the Study of Superfluid [superscript 3]He},
author = {Pollanen, J. and Choi, H. and Davis, J.P. and Blinstein, S. and Lippman, T.M. and Lurio, L.B. and Mulders, N. and Halperin, W.P. and Delaware) and NWU)},
abstractNote = {We have performed Small Angle X-ray Scattering (SAXS) on uniaxially strained aerogels and measured the strain-induced structural anisotropy. We use a model to connect our SAXS results to anisotropy of the {sup 3}He quasiparticle mean free path in aerogel. Measurements of the low temperature phase diagram of superfluid {sup 3}He in 98% aerogel indicate a stable B-phase and a metastable A-like phase. Vicente et al. proposed that the relative stability of these phases can be attributed to local anisotropic scattering of the 3He quasiparticles by the aerogel network. This network consists of silica strands with a diameter of {approx} 30 {angstrom} and average separation {zeta}{sub a} {approx} 300 {angstrom}. Vicente et al. also proposed using uniaxial strain of the aerogel to produce global anisotropy. We have performed SAXS on two uniaxially strained aerogels and found that strain introduces anisotropy on the {approx}100 {angstrom} length scale. We relate this to anisotropy of the quasiparticle mean free path, {lambda}.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Fri Mar 02 00:00:00 EST 2007},
month = {Fri Mar 02 00:00:00 EST 2007}
}

Conference:
Other availability
Please see Document Availability for additional information on obtaining the full-text document. Library patrons may search WorldCat to identify libraries that hold this conference proceeding.

Save / Share: