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Analysis of Strong-Coupling Parameters for Superfluid 3He

H. Choi·J. P. Davis·J. Pollanen·T. M. Haard·W. P. Halperin
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Abstract

Superfluid $^{3}$He experiments show strong deviation from the weak-coupling limit of the Ginzburg-Landau theory, and this discrepancy grows with increasing pressure. Strong-coupling contributions to the quasiparticle interactions are known to account for this effect and they are manifest in the five $β$-coefficients of the fourth order Ginzburg-Landau free energy terms. The Ginzburg-Landau free energy also has a coefficient $g_{z}$ to include magnetic field coupling to the order parameter. From NMR susceptibility experiments, we find the deviation of $g_{z}$ from its weak-coupling value to be negligible at all pressures. New results for the pressure dependence of four different combinations of $β$-coefficients, $β$_{345}, $β$_{12}, $β$_{245}, and $β$_{5} are calculated and comparison is made with theory.

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H. Choi, J. P. Davis, J. Pollanen, T. M. Haard, W. P. Halperin. 2006-11-17. Analysis of Strong-Coupling Parameters for Superfluid 3He. https://doi.org/10.1007/s10909-007-9420-z

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