Spin waves and spin diffusion in Fermi liquids: Bounds on effective diffusion coefficients

descriptionPublicationkeyboard_double_arrow_right Article 01 Apr 1986 English Publisher:American Physical Society (APS)Journal:Physical Review B, volume 33, pages 4,543-4,556 (issn: 0163-1829,

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Authors: , Bedell; , Meltzer;

doi: 10.1103/physrevb.33.4543

pmid: 9938916

Spin waves and spin diffusion in Fermi liquids: Bounds on effective diffusion coefficients

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Abstract

We investigate the accuracy of the usual relaxation-time approximations, involving the spin-diffusion lifetime tau/sub D/, which are generally made in analyses of spin waves and the Leggett-Rice effect in Fermi liquids. By employing the variational methods of Ah-Sam, Hojgaard-Jensen, and Smith and of Egilsson and Pethick, we are able to determine upper and lower bounds on the effective diffusion coefficient resulting from spin-wave phenomena which are accurate in the whole Fermi-liquid regime (T<

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