Critical dynamics of a uniaxial and dipolar ferromagnet

Citation
S. Henneberger et al., Critical dynamics of a uniaxial and dipolar ferromagnet, PHYS REV B, 60(13), 1999, pp. 9630-9649
Citations number
34
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
PHYSICAL REVIEW B-CONDENSED MATTER
ISSN journal
01631829 → ACNP
Volume
60
Issue
13
Year of publication
1999
Pages
9630 - 9649
Database
ISI
SICI code
0163-1829(19991001)60:13<9630:CDOAUA>2.0.ZU;2-C
Abstract
We study the critical dynamics of three-dimensional ferromagnets with uniax ial anisotropy by taking into account exchange and dipole-dipole interactio n. The dynamic spin-correlation functions and the transport coefficients ar e calculated within a mode coupling theory. It is found that the crossover scenario is determined by the subtle interplay between three length scales: the correlation length, the dipolar, and uniaxial wave vector. We compare our theoretical findings with hyperfine interaction experiments on Gd and f ind quantitative agreement. This analysis allows us to identify the univers ality class for Gd. It also turns out that the mu SR relaxation rate can be best fitted if it is assumed that muons occupy octahedral interstitials si tes within the Gd lattice. [S0163-1829(99)04237-X].