title: 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>or=1.73 mK. The 3He concentration x(3) was adjusted close to the value x(c) approximately 3.8% at which the spin-rotation parameter muM0 vanishes. In this way the transverse and longitudinal spin-diffusion coefficients D( perpendicular ),D( parallel ) were measured while keeping |muM(0)|<1. It is found that the temperature dependence of D( perpendicular ) deviates strongly from 1/T(2), with anisotropy temperature T(a)=4.26(+0.18)(-0.44) 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.
authors.affiliation: Physics Department, University of Massachusetts, Amherst, Massachusetts 01003, USA.
authors.forename: H
authors.initials: H
authors.lastname: Akimoto
authors.forename: D
authors.initials: D
authors.lastname: Candela
authors.forename: J S
authors.initials: JS
authors.lastname: Xia
authors.forename: W J
authors.initials: WJ
authors.lastname: Mullin
authors.forename: E D
authors.initials: ED
authors.lastname: Adams
authors.forename: N S
authors.initials: NS
authors.lastname: Sullivan