Journal of Low Temperature Physics

, Volume 101, Issue 1–2, pp 185–194 | Cite as

Nuclear magnetic resonance of3He superfluid confined in high porosity aerogel

  • D. T. Sprague
  • T. M. Haard
  • J. B. Kycia
  • M. R. Rand
  • Y. Lee
  • P. J. Hamot
  • W. P. Halperin
Invited Talks

Abstract

We report pulsed nuclear magnetic resonance (NMR) measurements of the transverse frequency and magnetization of3 He confined in aerogel with 98.2% open volume porosity. A homogeneous superfluid phase is observed at pressures, P > 12 bar, accompanied by a sharp onset of frequency shifts showing little or no textural broadening; a result quite unexpected for3He confined in random porous media. The transition temperatures and order parameter are both significantly suppressed from their bulk values and the magnetization data indicate this low temperature phase is an equal-spin pairing superfluid. For NMR tipping angles greater than 40 ° the resonance frequency drops abruptly to the normal state value. This tip angle dependence is not consistent with either the bulk3He-A or3He-B superfluid phases.

PACS numbers

67.40. Yv 67.57.−z 67.80.Jd 67.57.P 

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Copyright information

© Plenum Publishing Corporation 1995

Authors and Affiliations

  • D. T. Sprague
    • 1
  • T. M. Haard
    • 1
  • J. B. Kycia
    • 1
  • M. R. Rand
    • 1
  • Y. Lee
    • 1
  • P. J. Hamot
    • 1
  • W. P. Halperin
    • 1
  1. 1.Department of Physics and AstronomyNorthwestern UniversityEvanston

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