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Magnétisme nucléaire de l'3He liquide : nouvelle détermination du paramètre de Landau F0a

Abstract : 3He is a model Fermi liquid, isotropic, its Fermi temperature is attainable and the interaction between atoms can be controled by changing the pressure of the liquid. In this document, we present accurate Cw-NMR measurements of the nuclear magnetic susceptibility of liquid 3He as a function of temperature and pressure. The emphasis has been placed in reliable thermometry, 3He pressure measurements directly in the cell to increase the measuring range until solidification, and an accurate characterization of the NMR spectrometer.

Our measurements give an effective Fermi temperature 5% lower than former results. The Landau parameter F0a depends on the effective mass, which is determined by specific heat measurements, and consequently on the temperature scale. The re-analysis of the specific heat measurements with the PLTS-2000 temperature scale yields an effective mass increase of 4.5%. In this document, F0a is determined for two temperature scales (PLTS-2000 and Greywall). Contrarily to former measurements, the F0a density dependence does not show any saturation at high pressures.
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Contributor : Valérie Goudon <>
Submitted on : Sunday, October 7, 2007 - 10:26:04 AM
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Valérie Goudon. Magnétisme nucléaire de l'3He liquide : nouvelle détermination du paramètre de Landau F0a. Matière Condensée [cond-mat]. Université Joseph-Fourier - Grenoble I, 2006. Français. ⟨tel-00177281⟩

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