Giant viscosity enhancement in a spin-polarized Fermi liquid
Abstract
The viscosity is measured for a Fermi liquid, a dilute 3He-4He mixture, under extremely high magnetic field/temperature conditions (B ≤ 14.8 T, T ≥ 1.5 mK). The spin splitting energy μ B is substantially greater than the Fermi energy kB TF; as a consequence the polarization tends to unity and s-wave quasiparticle scattering is suppressed for T TF. Using a novel composite vibrating-wire viscometer an enhancement of the viscosity is observed by a factor of more than 500 over its low-field value. Good agreement is found between the measured viscosity and theoretical predictions based upon a t-matrix formalism.
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