Monte Carlo study of the classical Heisenberg antiferromagnet with easy-plane anisotropy on a triangular lattice

被引:4
作者
Capriotti, L
Cuccoli, A
Tognetti, V
Vaia, R
机构
[1] Scuola Int Super Studi Avanzati, I-34013 Trieste, Italy
[2] Univ Florence, Dipartimento Fis, I-50125 Florence, Italy
[3] CNR, Ist Elettron Quantist, I-50127 Florence, Italy
关键词
D O I
10.1063/1.369086
中图分类号
O59 [应用物理学];
学科分类号
摘要
In this paper the thermodynamics of the classical Heisenberg antiferromagnet with easy-plane anisotropy on a triangular lattice is investigated by means of Monte Carlo simulations. The topological frustration and the anisotropy of the exchange interaction turn out in a rich phase diagram showing the signatures of two distinct phase transitions, i.e., a Berezinkii-Kosterlitz-Thouless transition, also present in the unfrustrated counterparts of the model and associated with the vortex-antivortex unbinding, and an Ising-like one with a discrete order parameter, the chirality. These effects of the frustration, already observed in the XY model (or planar rotator), were not yet known in the model we studied, which is, being the spins three dimensional vectors, a more realistic description of a spin system. Data are reported in a broad range of temperatures for four values of the easy-plane anisotropy and for lattice sizes ranging from 24x24 to 120x120. (C) 1999 American Institute of Physics. [S0021-8979(99)76008-1].
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页码:6073 / 6075
页数:3
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