Two-Dimensional Heisenberg Model with Spin s=1/2 and Antiferromagnetic Exchange Treated as a Spin Liquid

被引：7

作者：

Kuz'min, E. V. ^{[1
]}

机构：

[1] Russian Acad Sci, LV Kirensky Phys Inst, Siberian Div, Krasnoyarsk 660036, Russia

来源：

PHYSICS OF THE SOLID STATE | 2002年 / 44卷 / 06期

基金：

俄罗斯基础研究基金会;

关键词：

Spectroscopy; Function Method; Correlation Length; Spin System; Singlet State;

D O I：

10.1134/1.1485019

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

The spin system of the Heisenberg model (s = 1/2) on a square lattice with antiferromagnetic (AFM) exchange between nearest neighbors (in which there is no long-range magnetic order at any T not equal 0) is treated as a spatially homogeneous isotropic spin liquid. The double-time temperature Green's function method is used in the framework of a second-step decoupling scheme. It is shown that, as T -> 0, the spin liquid goes over (without any change in symmetry) to a singlet state with energy (per bond) epsilon(0) = -0.352 and the correlation length diverges as xi proportional to T-1 exp(T-0/T). The spatial spin correlators oscillate in sign with distance, as in the AFM state. The theory allows one to calculate the main characteristics of the system in all temperature ranges. (C) 2002 MAIK "Nauka/Interperiodica".

引用

页码：1122 / 1129

页数：8

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