Off-equilibrium study of the fluctuation-dissipation relation in the easy-axis Heisenberg antiferromagnet on the kagomé lattice

S. Bekhechi and B. W. Southern
Phys. Rev. B 67, 212406 – Published 19 June 2003
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Abstract

Violation of the fluctuation-dissipation theorem (FDT) in a frustrated Heisenberg model on the kagomé lattice is investigated using Monte Carlo simulations. The model exhibits glassy behavior at low temperatures accompanied by very slow dynamics. Both the spin-spin autocorrelation function and the response to an external magnetic field are studied. Clear evidence of a constant value of the fluctuation-dissipation ratio and long-range memory effects is observed in this model. The breakdown of the FDT in the glassy phase follows the predictions of mean-field theory for spin glasses with one-step replica symmetry breaking.

  • Received 27 February 2003

DOI:https://doi.org/10.1103/PhysRevB.67.212406

©2003 American Physical Society

Authors & Affiliations

S. Bekhechi and B. W. Southern

  • Department of Physics and Astronomy, University of Manitoba, Winnipeg, Manitoba, Canada R3T 2N2

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Vol. 67, Iss. 21 — 1 June 2003

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