The Heat Capacity of 3 He-B in Silica Aerogel

Document Type

Article

Publication Date

10-1-2023

Abstract

The thermodynamic potential for superfluid 3 He-B embedded in a homogeneously distributed random potential is calculated from a quasiclassical reduction of the Luttinger–Ward functional to leading order in s= kBTc/ Ef . The resulting functional provides an extension of the Ginzburg–Landau free energy functional to all temperatures 0 < T≤ Tc . Theoretical predictions based on this functional for the heat capacity of superfluid 3 He-B embedded in homogeneous, isotropic silica aerogel are in good agreement with experimental reports for superfluid 3 He-B infused into 98.2% porous silica aerogel over the pressure range p=11-29bar . The analysis supports a conclusion that superfluid 3 He-B infused into high-porosity silica aerogels is a gapless superfluid at all pressures.

Publication Source (Journal or Book title)

Journal of Low Temperature Physics

First Page

42

Last Page

50

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