Analysis of Strong-Coupling Parameters for Superfluid 3He

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 $\beta$-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 $\beta$-coefficients, $\beta$_{345}, $\beta$_{12}, $\beta$_{245}, and $\beta$_{5} are calculated and comparison is made with theory.

6 pages, 2 figures, 1 table. Manuscript prepared for QFS2006

References in corpus (1)

• Strong Coupling Corrections to the Ginzburg-Landau Theory of Superfluid ^{3}He