## 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.

Original language | English (US) |
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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 |

## 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

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