Observation of suppressed viscosity in the normal state of 3He due to superfluid fluctuations
Abstract
By monitoring the quality factor of a quartz tuning fork oscillator we have observed a fluctuation-driven reduction in the viscosity of bulk 3He in the normal state near the superfluid transition temperature, Tc. These fluctuations, which are only found within 100 μK of Tc, 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 3He under strong confinement. Here we characterize the temperature and pressure dependence of the fluctuation signature, finding data collapse consistent with the predicted theoretical behavior.
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