Chiral Phase Transition of Planar Antiferromagnets Analyzed by the Super-Effective-Field Theory

概要

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The super-effective-field theory (SIFT) proposed by one of the present authors(M.S.) is applied to the antiferromagnetic planar model on a two-dimensionaltriangular lattice (AFPT model) in order to understand the nature of chiral order by aseries of mean-field-type approximations. Appro>cimants are constructed for clustersof various sizes up to 651 sites and calculated by use of the Monte Carlo technique.The critical temperature T. and the exponent y are estimated as 7'.=0.5096(5) and)' = 1.7(2) respectively. Some of characteristic features of this model such as the rela-tion between the KT-like and Ising-like transitions are discussed from a viewpoint ofthe present theory.[chira1 order, AFPT model, phase transition, super-effective-field theory, ll coherent-anomaly method, KT transitionl
社団法人日本物理学会の論文
1989-09-15