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Giant viscosity enhancement in a spin-polarized Fermi liquid

Giant viscosity enhancement in a spin-polarized Fermi liquid

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Giant viscosity enhancement in a spin-polarized Fermi liquid

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  1. H. Akimoto1,2, J. S. Xia2, D. Candela 3, W.J. Mullin,3 E.D. Adams2,and N.S. Sullivan2 Giant viscosity enhancement in a spin-polarized Fermi liquid 1 Nano-Science Joint Laboratory, RIKEN, Wako, Saitama 351-0198, Japan 2 NHMFL High B/T Facility &Physics Department, University of Florida, Gainesville, FL 32611 3 Physics Department, University of Massachusetts, Amherst, MA 01003 Spin polarization provides a powerful tool for investigating the quantum states of Fermi liquids, such as degenerate electrons, ultra-cold atoms, and 3He-4He mixtures. If the magnetic field is sufficiently high so that the Fermi energy is less than the splitting of the spin states, the polarization tends exponentially to unity as the temperature is lowered. As a result, the s-wave scattering decreases and the viscosity increases. In this work we measured this effect for the first time in dilute 3He - 4Heliquid mixtures. The viscosity measured for extremely high magnetic field/temperature conditions (B~ 15 T, T~ 2mk) for which the spin polarization attains values greater than 99%, was found to increase by a factor of more than 500 over its low field value. The work at the NHMFL was supported by NHMFL IHRP grant #5053, PI: N. Sullivan, Co-PIs: D. Candela, E.D. Adams & J.S. Xia Phys. Rev. Lett. 99, 095301 (2007)