New Evidence for Zero-Temperature Relaxation in a Spin-Polarized Fermi Liquid
Abstract
Spin-echo experiments are reported for 3He-4He solutions under extremely high B/T conditions, B=14.75 T and T >= 1.73 mK. The 3He concentration x3 was adjusted close to the value xc = 3.8% at which the spin rotation parameter muM0 vanishes. In this way the transverse and longitudinal spin diffusion coefficients Dperp, Dparallel were measured while keeping |muM0| < 1. It is found that the temperature dependence of Dperp deviates strongly from 1/T2, with anisotropy temperature Ta = 4.26 +/- 0.18 mK. 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.
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