Nonequilibrium dynamics of spin glasses and the observability of spin-glass correlations in simple magnetic scattering (invited)

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Abstract

A theory, developed in collaboration with Fisher, of the nonequilibrium behavior of spin glasses for temperatures, T, below the ordering temperature, Tg, is first reviewed. The magnetic structure factor, S(q), of a spin glass that is magnetized either due to the presence of a uniform magnetic field, h, or due to having been field cooled to T<Tg is then examined. It is found that long-range spin-glass correlations, if present, are directly observable in S(q) whenever the sample is magnetized. For example, for T>Tg, h=0, and 0<q≪ξ-1s, where ξs is the correlation length of any short-range (e.g., spin-density wave, ferro- or antiferromagnetic) order, d2S(q)/dh 2∝-ĜEA(q), where ĜEA(q) is the Fourier transform of the usual Edwards-Anderson (spin-glass) correlation function. Thus, one can, in principle, directly measure (a) the spin-glass correlation length when the sample is at equilibrium, and (b) the nonequilibrium spin-glass correlation length (domain size) when the sample is in a nonequilibrium state produced by field cooling.

Original languageEnglish (US)
Pages (from-to)5776-5780
Number of pages5
JournalJournal of Applied Physics
Volume64
Issue number10
DOIs
StatePublished - Dec 1 1988
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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