Zero-temperature relaxation in spin-polarized fermi liquids

Abstract

We discuss the effect of zero-temperature attenuation, which has been recently observed in spin dynamics of spin-polarized Fermi liquids, on other Fermi-liquid processes. The transfer of" this attenuation mechanism J?om transverse spin dynamics to longitudinal processes can be caused by the magnetic dipole interaction, namely, by the direct dipole processes and the dipole coupling between the transverse spin dynamics and the longitudinal transport and relaxation processes. We calculated the zero-temperature sound attenuation in spin-polarized Fermi liquids, corrections to the threshold of spin-wave ( Castaing) instability, and the eJ]'ective zero-temperature viscosity and longitudinal relaxation time in low-and high-frequency regbnes.

Transverse spin dynamics in a spin-polarized Fermi liquid

“…The established zero-temperature attenuation of transversal spin waves in polarized Fermi liquid is transferred to longitudinal modes like paramagnons and sound waves via spin nonconserving magnetic dipole-dipole interaction 35 . In its turn the finite damping of longitudinal collective motions causes the finite damping of the Fermi-liquid quasiparticles.…”