1/S EXPANSION FOR THERMODYNAMIC QUANTITIES IN A 2-DIMENSIONAL HEISENBERG-ANTIFERROMAGNET AT ZERO TEMPERATURE

被引:164
作者
IGARASHI, J
机构
[1] Department of Physics, Faculty of Science, Osaka University, Toyonaka
来源
PHYSICAL REVIEW B | 1992年 / 46卷 / 17期
关键词
D O I
10.1103/PhysRevB.46.10763
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
We calculate the spin-wave dispersion, the perpendicular susceptibility, the spin-stiffness constant, and the sublattice magnetization of a two-dimensional Heisenberg antiferromagnet at T=0, to order 1/(2S)2, treating carefully the umklapp processes. Our numerical estimates for the thermodynamic quantities are in good agreement with series-expansion estimates, and satisfy the hydrodynamic relation very accurately.
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页码:10763 / 10771
页数:9
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