Evidence against an Almeida-Thouless line in disordered systems of Ising dipoles

Julio F. Fernández
Phys. Rev. B 82, 144436 – Published 26 October 2010
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  • INTRODUCTION
  • MODEL, METHOD, AND EQUILIBRATION
  • EQUILIBRIUM RESULTS
  • CONCLUSIONS
  • ACKNOWLEDGEMENTS
    • References

    Abstract

    By tempered Monte Carlo simulations, an Almeida-Thouless (AT) phase-boundary line in site-diluted Ising spin systems is searched for. Spins interact only through dipolar fields and occupy a small fraction of lattice sites. The spin-glass susceptibility of these systems and of the Sherrington-Kirkpatrick model are compared. The correlation length as a function of system size and temperature is also studied. The results obtained are contrary to the existence of an AT line.

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    • Received 20 June 2010

    DOI:https://doi.org/10.1103/PhysRevB.82.144436

    ©2010 American Physical Society

    Authors & Affiliations

    Julio F. Fernández

    • Instituto de Ciencia de Materiales de Aragón, CSIC-Universidad de Zaragoza, 50009 Zaragoza, Spain and Instituto Carlos I de Física Teórica y Computacional, Universidad de Granada, 18071 Granada, Spain

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    Vol. 82, Iss. 14 — 1 October 2010

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