Finite-size spin-wave theory of a collinear antiferromagnet

被引：4

作者：

Capriotti, L ^{[1
]}

机构：

[1] Univ Calif Santa Barbara, Kavly Inst Theoret Phys, Santa Barbara, CA 93106 USA

来源：

INTERNATIONAL JOURNAL OF MODERN PHYSICS B | 2003年 / 17卷 / 27期

基金：

美国国家科学基金会;

关键词：

quantum antiferromagnets; spin-wave theory; exact diagonalizations;

D O I：

10.1142/S0217979203023148

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The ground-state and low-energy properties of the two-dimensional J(1)-J(2) Heisenberg model in the collinear phase are investigated using finite-size spin-wave theory [Q. F. Zhong and S. Sorella, Europhys. Lett. 21, 629 (1993)], and Lanczos exact diagonalizations. For spin one-half-where the effects of quantization are the strongest-the spin-wave expansion turns out to be quantitatively accurate for J(2)/J(1) greater than or similar to 0.8. In this regime, both the magnetic structure factor and the spin susceptibility are very close to the spin-wave predictions. The spin-wave estimate of the order parameter in the collinear phase, m(dagger) similar or equal to 0.3, is in remarkable agreement with recent neutron scattering measurements on Li2VOSiO4.

引用

页码：4819 / 4829

页数：11

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