Effective-medium approximation for the dynamical excitations of percolating antiferromagnets

G. Polatsek, O. Entin-Wohlman, R. Orbach

Research output: Contribution to journalArticlepeer-review

Abstract

The dynamical-excitation spectrum of a diluted antiferromagnet is studied in the effective-medium approximation. Recent results based upon this approximation are revised and a detailed analysis of the structure factor for neutron scattering is carried out and evaluated numerically. The spectrum reveals a sharp crossover from extended to localized excitations at a crossover frequency, c(p-pc)3/2, where p is the percolation concentration and pc is the percolation threshold of the diluted antiferromagnet. The results are compared with recent neutron-diffraction experiments and with the scaling model for fractons.

Original languageEnglish
Pages (from-to)9353-9359
Number of pages7
JournalPhysical Review B-Condensed Matter
Volume39
Issue number13
DOIs
StatePublished - 1989
Externally publishedYes

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