Physics – Condensed Matter – Superconductivity
Scientific paper
2006-06-29
Physics
Condensed Matter
Superconductivity
6 pages, 2 figures, 1 table. Manuscript prepared for QFS2006
Scientific paper
10.1007/s10909-007-9420-z
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.
Choi Haecheon
Davis Peter J.
Haard T. M.
Halperin W. P.
Pollanen Johannes
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