Kavli Affiliate: Jeevak M. Parpia
| First 5 Authors: Rakin N. Baten, Yefan Tian, Eric N. Smith, Erich Mueller, Jeevak M. Parpia
| Summary:
By monitoring the quality factor of a quartz tuning fork oscillator we have
observed a fluctuation-driven reduction in the viscosity of bulk $^3$He in the
normal state near the superfluid transition temperature, $T_c$. These
fluctuations, which are only found within $100mu$K of $T_c$, play a vital role
in the theoretical modeling of ordering; they encode details about the Fermi
liquid parameters, pairing symmetry, and scattering phase shifts. They will be
of crucial importance for transport probes of the topologically nontrivial
features of superfluid $^3$He under strong confinement. We characterize the
temperature and pressure dependence of the fluctuation signature, finding a
remarkable collapse.
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