Theory of severe slowdown in the relaxation of rings and clusters with antiferromagnetic interactions
journal contributionposted on 2018-08-09, 09:45 authored by Ioannis RousochatzakisIoannis Rousochatzakis, Andreas M. Lauchli, Ferdinando Borsa, Marshall Luban
We show that in the severe slowing-down temperature regime the relaxation of antiferromagnetic rings and similar magnetic nanoclusters is governed by the quasicontinuum portion of their quadrupolar fluctuation spectrum and not by the lowest excitation lines. This is at the heart of the intriguing near-universal power-law temperature dependence of the electronic correlation frequency ωc with an exponent close to 4. The onset of this behavior is defined by an energy scale which is fixed by the lowest spin gap Δ0. This explains why the experimental curves of ωc for different cluster sizes and spins nearly coincide when T is rescaled by Δ0. © 2009 The American Physical Society.
This research was supported by the Department of Energy - Basic Energy Sciences under Contract No. DE-AC02-07CH11358.
Published inPhysical Review B - Condensed Matter and Materials Physics
CitationROUSOCHATZAKIS, I. ... et al., 2009. Theory of severe slowdown in the relaxation of rings and clusters with antiferromagnetic interactions. Physical Review B - Condensed Matter and Materials Physics, 79: 064421.
Publisher© American Physical Society (APS)
- AM (Accepted Manuscript)
Publisher statementThis work is made available according to the conditions of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) licence. Full details of this licence are available at: https://creativecommons.org/licenses/by-nc-nd/4.0/
NotesThis paper was accepted for publication in the journal Physical Review B - Condensed Matter and Materials Physics and the definitive published version is available at https://doi.org/10.1103/PhysRevB.79.064421