Critical Scattering and Dynamical Scaling in an Heisenberg Ferromagnet Neutron Spin Echo versus Renormalization Group Theory
Statistical Mechanics
2007-05-23 v1
Abstract
High resolution Neutron Spin Echo (NSE) spectroscopy was used to investigate the dynamics of an 3D Heisenberg ferromagnet in the exchange-controlled regime over a broad range of temperatures and momentum transfer. These results allow for the first time an extensive comparison between the experimental dynamical critical behavior and the predictions of the Renormalization Group (RG) theory. The agreement is exhaustive and surprising as the RG theory accounts not only for the critical relaxation but also for the shape crossover towards an exponential diffusive relaxation when moving from the critical to the hydrodynamic regime above .
Keywords
Cite
@article{arxiv.cond-mat/0703702,
title = {Critical Scattering and Dynamical Scaling in an Heisenberg Ferromagnet Neutron Spin Echo versus Renormalization Group Theory},
author = {Michel Alba and Stephanie Pouget and Peter Fouquet and Bela Farago and Catherine Pappas},
journal= {arXiv preprint arXiv:cond-mat/0703702},
year = {2007}
}
Comments
4 pages, 5 figures, letter submitted to Phys.Rev. Lett., 03/26/2007