Quantum Phase Transition in Quasi-two-dimensional Heisenberg Antiferromagnet with Single-Ion Anisotropy

被引：0
|
作者：
JI An-Chun TIAN Guang-Shan School of Physics
机构：
来源：
CommunicationsinTheoreticalPhysics | 2007年 / 47卷 / 01期
基金：
中国国家自然科学基金;
关键词：
spatially anisotropic Heisenberg model; single-ion anisotropy; functional integration; SchwingerBoson representation;
D O I：
暂无
中图分类号：
O413 [量子论];
学科分类号：
摘要：
In the present paper,we investigate the quantum phase transition in a spatially anisotropic antiferromag-netic Heisenberg model of S=1 with single-ion energy anisotropy.By using the Schwinger boson representation,wecalculate the Gaussian correction to the critical value J;caused by quantum spin fluctuations. We find that,for thepositive single-ion energy,a nonzero value of J;is always needed to stabilize the antiferromagnetic long-range orderin this model.It resolves a difference among literature and shows clearly that the effect of quantum fluctuations mayqualitatively change a result obtained by the mean-field theories on lower-dimensional systems.
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收藏
页码：171 / 180
页数：10
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