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We explain the anomalous temperature dependence of spin diffusion in liquid 3↑ and 3--4He mixtures. The anomaly is an experimental manifestation of a unique zero-temperature attenuation in the Fermi liquid theory. We extended our microscopic theory of spin dynamics in spin-polarized Fermi liquids to finite temperatures. The zero-temperature attenuation changes the behavior of the spectrum near the singular point. The data indicate that the superfluid transition temperature for 3He in 3--4He mixtures is much lower than the current estimates.

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© 1994 American Physical Society. All rights reserved.