Spin diffusion and relaxation in three-dimensional isotropic Heisenberg antiferromagnets

K. A. Kikoin, M. N. Kiselev

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

A theory is proposed for kinetic effects in isotropic Heisenberg antiferromagnets at temperatures above the Néel point. The scaling behavior of the generalized coefficient of spin diffusion and relaxation constant in the paramagnetic phase is studied in terms of the approximation of interacting modes. It is shown that the kinetic coefficients in an antiferromagnetic system are singular in the fluctuation region. The corresponding critical indices for diffusion and relaxation processes are calculated. The scaling dimensionality of the kinetic coefficients agrees with the predictions of dynamic similarity theory and a renormalization group analysis. The proposed theory can be used to study the momentum and frequency dependence of the kinetic parameters, and to determine the form of the scaling functions. The role of nonlocal correlations and spin-fluid effects in magnetic systems is discussed.

Original languageEnglish
Pages (from-to)994-1000
Number of pages7
JournalJournal of Experimental and Theoretical Physics
Volume85
Issue number5
DOIs
StatePublished - 1 Jan 1997
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy (all)

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