We have calculated the pair-breaking critical current for superfluid 3He-B at all temperatures by taking into account the anisotropic distortion of the order parameter in the presence of superflow. We find that the component of the order parameter along the flow δ∥ is strongly reduced, while δ⊥, the component perpendicular to the flow, slightly increases. The superfluid density ϱs has also been determined as a function of the superfluid velocity v s. Fermi liquid corrections are explicitly included and it is shown that these corrections lead to a drastic change in the functional dependence of δ∥, δ⊥, ϱs, etc., on v s. In contrast to this, the pair-breaking critical current is shown to be independent of the Fermi liquid corrections.
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This work was supported in part by the National Science Foundation under Grant No. DMR 76-21032.
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Vollhardt, D., Maki, K. & Schopohl, N. Anisotropic gap distortion due to superflow and the depairing critical current in superfluid 3He-B. J Low Temp Phys 39, 79–92 (1980). https://doi.org/10.1007/BF00118066
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DOI: https://doi.org/10.1007/BF00118066