Freezing temperature in dilute ising spin glasses with long-range interactions

B. E. Vugmeister, D. L. Huber, H. Rabitz

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1 Scopus citations

Abstract

The onset of spin-glass freezing in dilute Ising systems with long-range interactions is investigated with the use of numerical simulations. We show that taking pair correlations explicitly into account results in the renormalization of the interaction matrix and suppression of the density of localized states compared with conventional mean field theory. Application of the theory to the RKKY interaction in the dilute limit raises the question of the appropriate boundary eigenvalue of the effective interaction matrix that separates localized and extended states. We identify the onset of spin-glass freezing with the temperature Tg at which this boundary eigenvalue is equal to one. Numerical simulations reproduces the linear concentration dependence of Tg in the very dilute limit, in agreement with scaling relations, and show a significant improvement over the conventional mean-field theory in the value obtained for the freezing temperature.

Original languageEnglish (US)
Pages (from-to)873-888
Number of pages16
JournalJournal of Statistical Physics
Volume90
Issue number3-4
DOIs
StatePublished - Feb 1998

All Science Journal Classification (ASJC) codes

  • Statistical and Nonlinear Physics
  • Mathematical Physics

Keywords

  • Freezing temperature
  • Localized and extended states
  • Long-range interactions
  • Spin glasses

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