The mobility tensor of negative ions in the A phase of superfluid 3He is calculated for temperatures close to T c . In this regime the scattering of superfluid quasiparticles from an electron bubble is practically elastic and the mobility tensor is expressed in terms of momentum transfer cross sections for an ion at rest. These generalized transport cross sections are obtained from the quasiparticle-ion scattering T-matrix, which we evaluate in terms of the normal state scattering amplitude. The p-wave pairing correlations in the intermediate states result in important interference effects among all partial waves in the scattering process, and, in addition, for the low-energy quasiparticles they lead to resonant states below the gap edge. These phenomena modify the scattering amplitude in the superfluid in an essential way and the differential quasiparticle-ion cross section is found to display strongly anisotropic, energy-dependent variations on the scale of the superfluid energy gap. We find that, in contrast to simple approximations, for low quasiparticle energies the parallel and perpendicular momentum transfer cross sections are very different from one another. Close to T c , the calculated mobility remains rather isotropic, but at lower temperatures the anisotropy is considerably larger than predicted by simple approximations for the cross section. The computed results are compared with the available measurements.
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Supported in part by U.S. National Science Foundation Grants DMR78-21068 and DMR78-21069.
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Salomaa, M., Pethick, C.J. & Baym, G. Mobility tensor of negative ions in superfluid 3He-A. J Low Temp Phys 40, 297–356 (1980). https://doi.org/10.1007/BF00117121
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DOI: https://doi.org/10.1007/BF00117121