1/S EXPANSION IN A 2-DIMENSIONAL FRUSTRATED HEISENBERG-ANTIFERROMAGNET

被引：39

作者：

IGARASHI, J

机构：

[1] Faculty of Engineering, Gunma University, Kiryu

来源：

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN | 1993年 / 62卷 / 12期

关键词：

1/S EXPANSION; J(1)-J(2) MODEL; FRUSTRATION; QUANTUM FLUCTUATION; SPIN WAVE;

D O I：

10.1143/JPSJ.62.4449

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We calculate the spin-wave dispersion and the sublattice magnetization up to second order in the 1/S expansion for the antiferromagnetic Heisenberg model with nearest-neighbor (J1) and second-neighbor (J2) couplings on a square lattice. The corrections to the linear spin-wave theory for the spin-wave dispersion and the sublattice magnetization grow large when the frustration increases. The expansion seems to converge asymptotically well for J2/J1 < 0.35, leading to quantitative estimates for both quantities. The corrections are positive for J2/J1<0.4, making the Neel ordered state more stable than what the linear spin-wave theory predicts. When J2/J1 exceeds 0.4, the second-order corrections grow very large with negative sign.

引用

页码：4449 / 4457

页数：9

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