FIELD-THEORETICAL CALCULATIONS ON THE HALDANE GAP OF QUASI-ONE-DIMENSIONAL HEISENBERG ANTIFERROMAGNETS

被引：0
|
作者：
Huang, Hai [1 ]
机构：
[1] N China Elect Power Univ, Dept Math & Phys, Beijing 102206, Peoples R China
来源：
INTERNATIONAL JOURNAL OF MODERN PHYSICS B | 2009年 / 23卷 / 31期
基金：
中国国家自然科学基金;
关键词：
Heisenberg model; Antiferromagnet; Haldane gap; INELASTIC NEUTRON-SCATTERING; QUANTUM ENERGY-GAP; BOND GROUND-STATES; RENORMALIZATION-GROUP; BOSE-CONDENSATION; MONTE-CARLO; CHAIN; SPIN-1; DYNAMICS; MODEL;
D O I：
10.1142/S0217979209053898
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
One-dimensional Heisenberg antiferromagnets can be described by the O(3) nonlinear sigma-model (NL sigma M). We give a review on zero temperature and finite temperature Haldane gaps obtained from this model. Based on the coupled-chain theory, we derive the finite temperature Haldane gap for triangular antiferromagnet RbNiCl3. The Neel temperature is obtained as 11 K. In order to treat the anisotropy in crystal Ni(C2H8N2)(2)NO2(ClO4), we relax the constraint of the NL sigma M and compute the finite temperature Haldane gap using a Ginzburg-Landau mean field approach. The comparison with the experimental data is discussed.
引用
收藏
页码：5789 / 5800
页数：12
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