Generalized Spin Glass Relaxation
Disordered Systems and Neural Networks
2009-02-25 v1 Other Condensed Matter
Abstract
Spin relaxation close to the glass temperature of CuMn and AuFe spin glasses is shown, by neutron spin echo, to follow a generalised exponential function which explicitly introduces hierarchically constrained dynamics and macroscopic interactions. The interaction parameter is directly related to the normalised Tsallis non-extensive entropy parameter, q, and exhibits universal scaling with reduced temperature. At the glass temperature q=5/3 corresponding, within Tsallis' q-statistics, to a mathematically defined critical value for the onset of strong disorder and non-linear dynamics.
Keywords
Cite
@article{arxiv.0902.4183,
title = {Generalized Spin Glass Relaxation},
author = {R M Pickup and R Cywinski and C Pappas and B Farago and P Fouquet},
journal= {arXiv preprint arXiv:0902.4183},
year = {2009}
}
Comments
4 pages: accepted for publication in Physical Review Letters (Feb 2009)