Abstract
Superfluid 3He 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.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 507-511 |
| Number of pages | 5 |
| Journal | Journal of Low Temperature Physics |
| Volume | 148 |
| Issue number | 5-6 |
| DOIs | |
| State | Published - Sep 2007 |
Funding
Fig. 2 (Color on-line) Four combinations of the βi’s from Table 1, normalized to their weak-coupling values, are compared with calculation by Sauls and Serene [3]. The set of thin lines that spans the entire pressure range is from experiment and the set of bold lines above 12 bar is from the theory Acknowledgements This research is supported by National Science Foundation, DMR-0244099. We thank D. Rainer and J.A. Sauls for their helpful discussion.
Keywords
- 67.57.-z
- 67.57.Bc
- 67.57.Lm
ASJC Scopus subject areas
- Atomic and Molecular Physics, and Optics
- General Materials Science
- Condensed Matter Physics