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New Evidence for Zero-Temperature Relaxation in a Spin-Polarized Fermi Liquid

“…Interestingly, our measured T a is nearly consistent with the theoretical value µ 3 B/2πk B = 3.73 mK predicted for very dilute solutions, and is considerably smaller than the value 22±3 mK that is obtained by extrapolating earlier results for this x 3 to our higher field [8]. Recently Buu, et al reanalyzed NMR data taken at x 3 = 6.1% taking into account restricted diffusion effects, and concluded that T a is considerably smaller than previously thought, although still 2.2 times larger than the dilute-solution value [11].…”

“…This value is close to the theoretical prediction for dilute solutions, and suggests that spin current relaxation remains finite as the temperature tends to zero.A fundamental result of Fermi liquid theory is that the quasiparticle scattering time and hence the transport coefficients diverge as the temperature tends to zero. Recently, there has been much interest in the possibility that spin polarization could remove this divergence for transverse spin currents by creating scattering phase space between spin-up and spin-down Fermi surfaces [1,2,3,4,5,6,7,8,9,10,11]. Thus the transverse spin diffusion coefficient D ⊥ would remain finite at zero temperature in a partially spin-polarized Fermi liquid, while the other transport coefficients (longitudinal spin diffusion, viscosity, thermal conductivity) would diverge as in an unpolarized system.…”

Transverse spin dynamics in a spin-polarized Fermi liquid

“…The results on whether or not the transverse relaxation time saturates at low temperatures in spin-polarized Fermi liquids so far have been contradictory. The recent spin echo experiments the most probably suggest that spin current relaxation remains finite as temperature tends to zero [29][30][31] . At first sight the large angle deviations, which are the principal feature of the spin echo method, prevent of application of our theory where the transverse spin attenuation is calculated in linear on the transverse perturbations approximation.…”