Continuous- and first-order phase transitions in Ising anti ferromagnets with next-nearest-neighbour interactions

A. Malakis, P. Kalozoumis, Nikolaos G. Fytas

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Abstract

Both the square and triangular Ising antiferromagnetic systems with next-nearest neighbour interactions are studied by a new efficient entropic scheme. Using the energy distribution and order parameter's fourth order cumulant it is illustrated that the two models behave quite differently, For the square model we establish strong numerical evidence showing a continuous transition scaling, whereas for the triangular model a first-order transition is verified. Our results are compared with the existing predictions and controversies in the literature.
Original languageEnglish
Pages (from-to)1-10
JournalReviews on Advanced Materials Science
Volume14
Issue number1
Publication statusPublished - Apr 2007

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Keywords

  • MONTE-CARLO SIMULATIONS
  • SQUARE-LATTICE
  • CRITICAL-BEHAVIOR
  • 2ND-NEIGHBOR INTERACTIONS
  • VARIATIONAL APPROXIMATIONS
  • MODEL
  • 1ST-NEIGHBOR
  • ALGORITHM
  • DIAGRAMS
  • ANTIFERROMAGNETS

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