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Reentrant transitions in the van Hemmen model of a spin glass

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  • Jȩdrzejewski, J.
  • Komoda, A.
  • Mozrzymas, J.

Abstract

The van Hemmen model of a spin glass, which is an Ising model with random couplings Jij between sites i and j equal to J0 + J(ξiηj + ξjηi), where (ξi, ηi) are independent, identically distributed random variables, is studied in the pair approximation of the cluster variation method. For the family of probability distributions 12(1 − p)δ(ξi − a) + pδ(ξi) + 12 (1 − p)δ(ξi + a), where p is varied, phase diagrams are constructed. They are qualitatively different from the mean-field phase diagrams and display a competition between tendencies towards spin-glass and towards ferromagnetic ordering, which results in reentrant transitions. It is argued that the observed effects are not accidental but are borne by the competition of bonds of the underlying lattice system.

Suggested Citation

  • Jȩdrzejewski, J. & Komoda, A. & Mozrzymas, J., 1988. "Reentrant transitions in the van Hemmen model of a spin glass," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 150(3), pages 499-511.
    • Handle: RePEc:eee:phsmap:v:150:y:1988:i:3:p:499-511
    DOI: 10.1016/0378-4371(88)90252-X
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    References listed on IDEAS

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    1. Storing, Herbert J. & Strauss, Leo & Berns, Walter & Storing, Herbert J. & Weinstein, Leo & Horwitz, Robert, 1963. "Replies to Schaar and Wolin: I," American Political Science Review, Cambridge University Press, vol. 57(1), pages 151-160, March.
    2. Ghatak, S. & Turner, R. K., 1978. "Pesticide use in less developed countries -- economic and environmental considerations," Food Policy, Elsevier, vol. 3(2), pages 136-146, May.
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