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Article Dans Une Revue Journal de Physique Colloques Année : 1988

CONTINUOUS VERSUS FIRST ORDER TRANSITION IN DILUTE ISING ANTIFERROMAGNETS IN A FIELD

H. Diep
  • Fonction : Auteur
Serge Galam
P. Azaria
  • Fonction : Auteur

Résumé

A systematic Monte Carlo investigation of dilute Ising antiferromagnets in a uniform field as function of both dilution and ratio α of nnn to nn interactions on a cubic lattice is presented. A tricritical point is found in the range of dilution 0 ≤ p ≤ 0.3 for a ratio α = -0.5. Increasing p makes the first order region to shrink. On the other hand increasing α enlarges it. We present a new probabilistic mean field treament which yields the correct qualitative features of the phase diagram.

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jpa-00228787 , version 1 (04-02-2008)

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H. Diep, Serge Galam, P. Azaria. CONTINUOUS VERSUS FIRST ORDER TRANSITION IN DILUTE ISING ANTIFERROMAGNETS IN A FIELD. Journal de Physique Colloques, 1988, 49 (C8), pp.C8-1261-C8-1262. ⟨10.1051/jphyscol:19888573⟩. ⟨jpa-00228787⟩

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