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29 March 2024
 
  » arxiv » cond-mat/0606786

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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 ;
Date 30 Jun 2006
Subject Superconductivity; Other
AbstractSuperfluid $^{3}$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 $eta$-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 $eta$-coefficients, $eta$_{345}, $eta$_{12}, $eta$_{245}, and $eta$_{5} are calculated and comparison is made with theory.
Source arXiv, cond-mat/0606786
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