Nuclear magnetic resonance of {sup 3}He superfluid confined in high porosity aerogel

Journal Article · Sun Oct 01 04:00:00 EDT 1995 · Journal of Low Temperature Physics

DOI:https://doi.org/10.1007/BF00754575· OSTI ID:198170

Sprague, D T; Haard, T M; Kycia, J B ^[1]

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1. Northwester Univ., Evanston, IL (United States); and others

We report pulsed nuclear magnetic resonance (NMR) measurements of the transverse frequency and magnetization of {sup 3}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 shouting little or no textural broadening; a result quite unexpected for {sup 3}He 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{degrees} the resonance frequency drops abruptly to the normal state value. This tip angle dependence is not consistent with either the bulk {sup 3}He-A or {sup 3}He-B superfluid phases.

• Sponsoring Organization: USDOE
• OSTI ID: 198170
• Report Number(s): CONF-950676--
• Journal Information: Journal of Low Temperature Physics, Journal Name: Journal of Low Temperature Physics Journal Issue: 1-2 Vol. 101; ISSN JLTPAC; ISSN 0022-2291
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
HELIUM 3
MAGNETIZATION
NUCLEAR MAGNETIC RESONANCE
PHASE DIAGRAMS
POROUS MATERIALS
SUPERFLUIDITY
TEMPERATURE DEPENDENCE