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Phase transitions in Ising square antiferromagnets with first- and second-neighbour interactions

1994
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Journal of Physics: Condensed Matter
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The phase transitions occurring in the king square antiferromagnet with fim-(31) and second-( 1 2 ) nearest-neighbour interactions are studied using several mean-field approximations and for a wide range of R = 32/31, The largest approximation used corresponds to a ninepoint cluster approximation of the cluster variation method. In this w e , the hansition temperatures as a function of R are found to be in excellent agreement with those obtained by othex methods. The mean-field approximations

doi:10.1088/0953-8984/6/45/025
fatcat:3rtyqkfq3vbcrae4juto6gvnve