ANTIFERROMAGNETIC STACKED TRIANGULAR LATTICES WITH HEISENBERG SPINS - PHASE-TRANSITION AND EFFECT OF NEXT-NEAREST-NEIGHBOR INTERACTION

被引:49
作者
LOISON, D
DIEP, HT
机构
[1] Groupe de Physique Statistique, Université de Cergy-Pontoise, 95806 Cergy-Pontoise Cedex, 49, Avenue des Genottes
来源
PHYSICAL REVIEW B | 1994年 / 50卷 / 22期
关键词
D O I
10.1103/PhysRevB.50.16453
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
We study by extensive histogram Monte Carlo simulations the phase transition in the antiferromagnetic stacked triangular lattices with classical Heisenberg spins. It is shown that in a range of the antiferromagnetic next-nearest-neighbor interaction J2, the transition is clearly of first order. We also reconsider the controversial question concerning the nature of the phase transition when J2=0: we show that the critical exponents obtained, in agreement with previous simulations, exclude the possibility of the O(4) class predicted by a nonlinear σ model in a 2+ renormalization-group calculation. The phase diagram in the (J2,T) space (T: temperature) is shown and discussed. For comparison, the phase diagram obtained by a Green-function method in the case of quantum Heisenberg spins is also shown. © 1994 The American Physical Society.
引用
收藏
页码:16453 / 16458
页数:6
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